Earlier this week, Katy Perry slammed Chief Keef's latest single "Hate Bein' Sober," and now she's apologizing to the rapper for her comments.

The pop star expressed her disgust with the song about drinking and taking drugs. She posted on Twitter: "Just heard a new song on the radio called I Hate Being Sober... I now have serious doubt for the world."

Keef tweeted in response:  "Dat (sic) b**ch Katy Perry... I'll smack the s**t out her."

Classy.

In order to stop a feud from blowing up, Perry clarified her remarks. ""Mr. Keef! I'm sorry if I offended you. I heard a lot of people guesting...

A concert listing has apparently revealed a surprising return to the stage for Lady Gaga following her hip surgery.

Songkick.com, which lists upcoming concerts of hot music stars, sent out an email detailing some of the most popular upcoming concerts. WENN reports that one of those concerts was Beyonce's return from overseas to finish up her Mrs. Carter tour in New York, and the supporting act list included Lady Gaga.

The current concert listing on the site makes no mention of Lady Gaga, Jay-Z, nor Kanye West being at the Barclays Center on August 3 - despite the email reportedly claiming...