Katy Perry joined The Rolling Stones on stage at the MGM Grand in Las Vegas Saturday night for a duet with singer Mick Jagger on the band's classic, "Beast Of Burden."

The pop singer was thrilled that she got to join the rock & roll legends on stage, tweeting, "Yes, I just did gyrated on Mick Jagger. WHAT?!" after the performance.

One fan called her out for saying she "did gyrated" though, writing, "the grammar in that tweet is appalling Katy."

"I noticed that. I guess I was too excited. Sorry mom," Katy replied.

Katy, 28, looked sexy, as always, and danced across the stage with Jagger,...

Katy Perry brought a little pop to The Rolling Stones' show on Saturday night by joining them onstage in Las Vegas.

The Brown Sugar hitmakers continued their 50 & Counting anniversary tour by headlining at Sin City's MGM Grand, and they thrilled fans with a special guest.

Perry performed a rendition of the Stones' track Beast of Burden, from their 1978 album Some Girls, and she took to her Twitter.com page to reveal she got up close and personal with singer Sir Mick Jagger.

In a post on her page, she writes, "Yes, I just (sic) did gyrated on Mick Jagger. WHAT?!"

The I Kissed a Girl hitm...

It was a who's who of celebrities at the "PUNK: Chaos to Couture" Costume Institute Gala at The Metropolitan in New York City on Monday night.

Some stars took the word "costume" very literally, dressing up like punks, teasing their hair, and laying the make-up on heavy. Other celebs opted for more traditional ball gowns.

Katy Perry, above, was the queen of the night, wearing a heavily jeweled dress featuring the Virgin Mary on it.

Metropolitan Museum of Art Director and CEO Thomas P. Campbell explained the punk theme: "Punk's signature mixing of references was fueled by artistic developm...

Katy Perry's preacher father Keith Hudson references his daughter's fame during his Sunday sermons -- referring to her as the "devil child."

The pop star's father also claims that he ends up crying while watching Katy in concert, according to Britain's The Sun, because the fans are worshipping her instead of God.

"I was at a concert of Katy's where there were 20,000," he said during a sermon in Santa Fe Springs, Calif., while he and wife Mary tour the country preaching. "I'm watching this generation and they were going at it. It almost looked like church.

"I stood there and wept and kept...

Katy Perry's third fragrance is named "Killer Queen." On Thursday, the pop star posted a shot of the bottle on Facebook, and she's slowly revealing more about the project.
 
Killer Queen will be a follow up to 2010's Purr and 2011's Meow.
 
On Thursday night, Perry held a fragrance launch party in New York. She greeted friends, fans and industry insiders while perched on a throne at the James B. Duke Mansion.
 
After the party she tweeted, "Just had an elegant unveiling of my new fragrance KILLER QUEEN at the Duke! Can't wait to share the royal juice! so sophisticated."

She added, "OK! I h...

We spotted Katy Perry wearing a patchwork floral print dress in New York City on Wednesday. The singer attended the Broadway production of "Kinky Boots" with a friend.

The pop star reportedly cried during the musical's finale. A source told the New York Post: "She was crying so hard she thought she lost an eyelash."

Cyndi Lauper, who wrote the music and lyrics for the production, later gave Perry a tissue and said soothingly, "Honey, I keep these on me at all times. I've been crying non-stop all week."

"Kinky Boots" received 13 Tony Award nominations on Tuesday morning.

While in the cit...

A slew of stars turned out for Saturday night's White House Correspondents' Association Dinner in Washington, D.C. The dinner is traditionally attended by politicians, members of the media and celebrities.

President Barack Obama poked fun of himself during his speech, joking at one point: "I'm not the strapping young Muslim Socialist that I used to be."

Stars including Kevin Spacey ("House of Cards"), Julia Louis-Dreyfus ("Veep"), Claire Danes ("Homeland"), Sofia Vergara ("Modern Family), Kerry Washington ("Scandal") and Korean entertainer Psy all showed up to the event.

Singer Katy Perr...

It's Fashion Fail Time! That means we take a break from letting you know how good all of your favorite stars look to show the other side of fashion: the fails!

Hopefully, Katy Perry found this "gem" of a dress at a flea market, because it's at least two decades out of date. Either that, or Perry has signed on to represent a new line of screen-less phones and... Spearmint gum?

I have no problems with kilts, even if Alan Cumming's has a very odd, almost computer-like pattern. But we will never, I repeat, NEVER condone dress shirts with the arms cut off.

I can't believe Matthew McCo...

Former besties Katy Perry and Rihanna apparently are on friendly terms again. Perry reportedly cooled her friendship with the Barbadian beauty a few months ago after Rihanna reconciled with her abusive ex-boyfriend Chris Brown.

But Katy recently tweeted Rihanna and joked about missing her friend while she was in Los Angeles. Katy wrote: Ermm...I was in LA Saturday night...Should I be proud or offended I wasn't invited @rihanna #WHOISTHISDOPPLEGANGER."

Rihanna tweeted back: "@katyperry erm I wasn't! Lol! #miaminights howeverrrrr....I'll still let you spank me!"

The famous duo then set a ...

Even celebrities are unlucky in love occasionally. Katy Perry's eight-month romance with John Mayer ended in March, and she's currently selling her 8,300-square-foot home for a $7 million.

Mayer recently told Ellen DeGeneres, "Coupling is a tricky thing." He's got that right!

But the pop star isn't sitting home and moping around. She recently completed a trip to Madagascar for UNICEF.  Perhaps she needs a relationship break? She's been officially divorced from Russell Brand for less than one year and started dating Mayer shortly after she split with her ex.

A pal recently told People mag...

Katy Perry went on a charity visit to Madagascar last week to help raise awareness of humanitarian issues in the country.

The California Gurls hit-maker made her first trip on behalf of the United Nations Children's Fund (UNICEF) to the island nation off the southeastern coast of Africa, where three out of four kids live in extreme poverty. While in Madagascar, Perry met with abused and abandoned children at a local shelter, stopped by a primary school rebuilt by UNICEF after a cyclone, and learned about Madagascar's malnutrition problem at a health center.

The 28-year-old singer also l...

John Mayer has made headlines in the past when discussing previous relationships with famous women. He called Jessica Simpson "sexual napalm" and spoke truthfully about getting out of a relationship with Jennifer Aniston. Now, he's answering questions about his recent break up with Katy Perry.

Ellen DeGeneres asked Mayer about his split with the pop star, and he said, "Listen, it was a very private relationship going in. It was a private relationship during and it's a private relationship, still."

Mayer acknowledged he understands why everyone is waiting for him to release juicy info on...

After several months Katy Perry and John Mayer's once-hot romance may have cooled. This week's issue of PEOPLE examines what may have gone wrong with the singers who got so serious, so fast. Have his jealousy and her career come between them? Following seven months jam-packed with relationship milestones – meeting the parents! house-hunting! a ring! – the once-inseparable couple have been spending time apart in L.A., showing signs that their romantic fireworks have flamed out.

While reps for Mayer, 35, and Perry, 28, had no comment when asked about the pair's split, Perry may have said eno...

Kristen Stewart and One Direction dominated Nickelodeon's Kids' Choice Awards on Saturday night, landing two top awards each. The winners received special orange blimps as trophies.
 
"The Twilight Saga: Breaking Dawn - Part 2" star won Favorite Movie Actress, and she also picked up the Favorite Female Buttkicker award for "Snow White and the Huntsman." The 22-year-old was inadvertently covered in green goo after hugging award presenters Sandra Bullock and Neil Patrick Harris, who had been slimed.

U.K. boy band One Direction was unable to attend the ceremony because they were performing a ...

John Mayer has announced he's hitting the road for a new tour just days after reportedly splitting from his latest love Katy Perry.

The Your Body Is A Wonderland hit-maker was forced to put his singing career on hold for six months last year after undergoing a second operation to remove a granuloma from his vocal cords.

He was also forced to scrap his Born and Raised tour in 2011 due to his throat problems, but now Mayer is heading out on his first trek in three years.

He tells Billboard magazine, "The greatest gift I have in my life is the opportunity to play again, which is also the...

Katy Perry and John Mayer have parted ways for the second time in their short relationship, only a few months after going public with their romance.

The two music stars began dating last summer before ending things in August, only to reconcile and get back together in September.

But according to UsMagazine.com Katy and John's latest split might not be the end for the couple.

"It's sad," a friend of the couple tells Us. "It's not over until it's over. You have to see how things play out."

"She's leaving the window open," added a second source. "They have both been so focused on work."

M...

Katy Perry's fans were sent into a frenzy on Wednesday when a saucy photo apparently showing the pop star posing seductively in a bikini went viral - until it emerged the image actually featured a topless model lookalike.

Followers of the I Kissed a Girl hit-maker thought they had struck gold when a photo of a pouting, sultry brunette posing in a striped red-and-white bikini while touching herself intimately began circulating on Twitter.com.

The image was re-tweeted so many times by excited male fans of the singer that it was listed in the 'Top Photos' under a search for Perry - but fol...

What's the first thing you think of when Katy Perry, Jennifer Love Hewitt, Christina Hendricks, Halle Berry or Kate Upton is mentioned?

Right, "boobs."

Thanks to magazines like Maxim, Esquire, Cosmopolitan, GQ and Playboy -- to name just a handful -- celebrity breastesses are constantly shoved in our faces.

Many stars get accused of having fake ones, like Salma Hayek; who swears hers are real and says they're "a present from God."

Others are obviously real (Katy Perry), while some are obviously fake (Mariah Carey).

But in the end it doesn't really matter if they look glorious.

So sit ...

You can't go one week without hearing a ridiculous story involving some of your favorite celebrities. Thankfully, the Starpulse Rumor Patrol is here to sort out what's real and what's fake.

Scarlett Johansson Engaged: The beautiful actress was recently spotted with a nice diamond ring on her finger while hanging out with boyfriend Romain Duariac. So is her French fella the luckiest guy in the world?

Verdict: False. Johansson's rep denies that the two are engaged. While the denial may not be a surprise, keep in mind that Johansson has only been dating Duariac since October - and after her ...

Katy Perry and John Mayer are not engaged. The ruby ring that sparked wedding bell rumors earlier this week was just a Valentine's Day gift from Mayer.

On Thursday night Perry wore the ring on her wedding finger, prompting gossips to suggest that Mayer had proposed on the most romantic day of the year. The singer's reps neither confirmed nor denied reports of impending nuptials.

However, a representative for Santa Barbara, Calif., jeweller Daniel Gibbings has revealed Mayer bought the ring as a Valentine's Day surprise for the pop star.
 
The rep told People.com that Mayer was "really sup...

Reports have surfaced that Katy Perry is engaged to boyfriend John Mayer, and her publicist is neither confirming nor denying them.
 
On Valentine's Day, the pop star was spotted with a ruby ring on her wedding finger during a romantic night out with the singer/songwriter, suggesting he had proposed. She was wearing the ring as they left Vicenti restauraunt in Brentwood, Calif.
 
Perry's people aren't commenting on the rumors.
 
The singer split from her husband, British actor and comedian Russell Brand, at the end of 2011.

Meanwhile, Mayer has opened up about his past womanizing ways, say...

It's February and awards season is in full swing with lots of stars hitting the red carpet. The numerous events going on not only include awards but also parties, premieres as well as the annual Mercedes Fashion Week in New York City.  This week was highlighted by the 55th annual Grammy awards, where we saw lots of fashion hits, as well as some outrageous misses (maybe they were just looking for attention). Katy Perry and a few others obviously missed the memo by Grammy officials (see above). None the less, ALL the stars were out and about at the Grammy arrivals, as well as the multitude of...

Katy Perry is reportedly no longer speaking to Rihanna because the singer doesn't approve of the Barbadian beauty's relationship with Chris Brown.

Perry is reportedly unhappy with RiRi's decision to reconcile with her ex, so she put the stops on their friendship, a source told UsMagazine.com.

The former besties kept their distance from each other at the Grammys on Sunday night. Instead, Perry hung out with her boyfriend John Mayer.

Brown was arrested for assaulting Rihanna in 2009 the night before the Grammy Awards. This year the couple was snapped enjoying the Grammys from the front ro...

John Mayer opened up about his relationship with Katy Perry, calling his relationship with the pop singer "something very human."

After months of denial, Mayer only recently confirmed that he and Katy are dating; and he says it's different this time around.

During an interview on CBS' "Sunday Morning" on Sunday, the singer discussed how he's matured from the days of kissing and telling, which earned him the reputation as a lothario in the press. He says he regrets all of that, has come to love himself and has high expectations for his relationship with Perry.

"I don't feel like I'm in a ...

Katy Perry dropped some serious cleavage in a mint green gown at last night's 55th Annual Grammy Awards.

The singer appeared to have found a (ahem) loophole around this year's Grammy dress code, which CBS sent out a memo about on Wednesday. The request asked artists to forget about wearing any outfits that show too much skin.

The front of the "Firework" singer's dress caught lots of attention though, even from comedienne Ellen DeGeneres, who was photographed with partner Portia De Rossi staring right at Katy's chest (see the photo at E! Online).

Katy showed up on the red carpet with BFF ...

  The 55th Annual Grammy Awards got off to a hot start on the red carpet, where music's biggest stars gathered before the main event at the Staples Center in Los Angeles.

Most stars adhered to the requests in the memo that CBS sent out on Wednesday, asking stars to tone their fashion choices down. The memo specifically asked that "buttocks and female breasts are adequately covered"; also warning that "see through" fashions, visible thongs and attire exposing any part of "genital regions" was forbidden at this year's award show.

Most stars followed the rules, including Jennifer Lopez, who ...

Kim Kardashian showed a little nipple in Toronto recently while celebrating her new jewelry line, but see-through clothing isn’t always sheer genius. It’s a sexy way to dress, but if you’re not careful you can show just a little too much.

Remember when Beyonce flashed her assets in a see-through Givenchy couture gown at the Met Gala in New York City? Va va voom!

Rihanna is also fond of getting raunchy occasionally, and Katy Perry attended Coachella over the summer in a see-through dress with her bra and panties proudly visible.

Then there's former Pussycat Dolls star Melanie Thornton (pi...

Singer Katy Perry is ditching John Mayer and taking her actress pal Allison Williams to the 2013 Grammy Awards as her date.

The Fireworks hit-maker has been dating Mayer since last year and they've recently taken their relationship to the next level by house-hunting in California.

However, instead of walking the red carpet as a couple, Perry has invited Girls star Williams, whose boyfriend Ricky Van Veen is close friends with Mayer, to accompany her to the big show on Sunday .

Williams tells Anderson Cooper, "I am going to the Grammys. Katy Perry is my date. She is the hottest date. S...

Katy Perry posed for photos with herself at Paramount Studios on Saturday afternoon as she unveiled her new wax figure, which will be featured at Madame Tussauds in Las Vegas.

The new figure, a few inches shorter (and a bit bustier) than the real Katy; features the singer's famous blue hairdo and a barely there silver outfit including a very short skirt and a bustier styled to make her boobs look like Hershey's Kisses, but with tassels reading 'Katy Kisses'.

"Whenever I have to go do something particularly that I don't necessarily want to do, I'm just sending her cause she's a great ident...

Katy Perry rocked the 2013 Kids' Inaugural Concert in Washington, D.C., on Saturday night. The singer showed off her sexy self in a patriotic red, white, and blue ensemble, which included a removable star-studded blue skirt and sequined stockings.

At one point she pulled off the skirt and revealed a corset-like bodysuit with red and white stripes and ruffles on the thighs. Va va voom!

Perry sung several of her hit songs, including "Teenage Dream," "Firework," Wide Awake" and "Part of Me." The event, which took place at the Washington Convention Center, was geared towards teens and was att...