SLAM= Verb Slang: To Criticize harshly; censure forcefully. Noun= A harsh or devastating criticism. Since the beginning of show business, in the celebrity news world actors and musicians have SLAMMED rumors, gossip, hearsay and chitchat as well as other unconfirmed reports.

However, the most interesting slams are when one star decides to SLAM another star. So this is a look back at some of the more notable and more prominent celebrity vs. celebrity SLAMMINGS from the past year:

Simon Cowell Slams Britney Spears

Music mogul Simon Cowell has blasted troubled stars Britney Spears and British star Robbie Williams for checking into rehab, insisting they have no idea of what hard life really is.

Moby Slams Bill O'Reilly

Dance star Moby has branded Fox newsman Bill O'Reilly "a very lonely man" following his outburst at "computer geeks."

Tina Fey Slams Paris Hilton

Former Saturday Night Live star and head writer Tina Fey has slammed Paris Hilton for being a horrible guest host on the comedy sketch show.

50 Cent Slams Oprah

Hardman rapper 50 Cent has hit out at Oprah Winfrey for refusing to have him as a guest on her chat show.

William H. Macy Slams Co-Star Lindsay Lohan

Veteran actor William H. Macy has blasted co-star Lindsay Lohan for her behavior while filming the movie Bobby, insisting she "should have her a** kicked."

Simon Cowell Slams Clay Aiken's Panic Attacks

Simon Cowell has slammed American Idol runner-up Clay Aiken for confessing he has been prescribed anti-anxiety medication Paxil after struggling to come to terms with his fame.

Justin Timberlake Slams Taylor Hicks

Justin Timberlake has hit out at American Idol winner Taylor Hicks, claiming "he can't carry a tune in a bucket."

Shannen Doherty Slams Lindsay Lohan's Behavior

Shannen Doherty insists her reported bad behavior was nothing compared to Lindsay Lohan's recent troubles.

Rob Schneider Slams Mel Gibson in Letter

Rob Schneider is the first actor to publicly announce he will never work with Mel Gibson due to the anti-Semitic remarks he made when he was arrested last Friday.

Pamela Anderson Slams Potential VP Sarah Palin

Pamela Anderson has become the latest celebrity to criticize U.S. Republican vice presidential candidate Sarah Palin.

Sharon Osbourne Slams 'Untalented' Hilton

Rock matriarch Sharon Osbourne has blasted socialite and TV-star Paris Hilton - branding her talentless.

Paris Hilton Slams John Mccain For Using Image
Socialite Paris Hilton has hit out at U.S. Republican presidential candidate John McCain after he used her image in a political advertisement to attack Barack Obama without her authorization.

Courtney Love Slams Billy Corgan Over Party

Rocker Courtney Love has publicly slammed Smashing Pumpkins frontman Billy Corgan over his alleged refusal to attend her daughter's forthcoming birthday party

Christopher Knight Slams Florence Henderson

Actor Christopher Knight has taken aim at his former Brady Bunch TV mom after she went public with her feelings about his wife last week.

Corey Feldman Slams Michael Jackson

Former teen star Corey Feldman has accused Michael Jackson of damaging his childhood, by befriending and then abandoning him.

Roseanne Barr Slams Madonna

Comedienne Roseanne Barr has launched an online attack on Madonna, accusing the pop star of abusing face-freezing Botox injections.

Kathleen Turner Slams Elizabeth Taylor's Acting

Outspoken actress Kathleen Turner has blasted Hollywood veteran Elizabeth Taylor's acting talents, insisting her performances in the screen icon's film remakes are "better" than the originals.

Sylvester Stallone Slams Janice Dickinson's Lies

Sylvester Stallone has hit back at ex-fiancée Janice Dickinson's claims he took steroids - calling her a liar.

Donald Trump Slams Britney Spears' Parents

Property mogul Donald Trump has hit out at Britney Spears' parents, blaming them for their daughter's current troubles.

Phil Collins Slams Paul McCartney

Former Genesis drummer Phil Collins has slammed Paul McCartney - insisting he would never work with the star again.

Honorable Mention Slammings

Martina Navratilova Slams Young Tennis Stars

Lesbian sporting legend Martina Navratilova has slammed young tennis stars for their "power-heavy" approach to the game.

David Hasselhoff Slams Reports He Was Drunk

Actor David Hasselhoff is firing back at press reports he was turned away from a British Airways flight because he was drunk, insisting he was ill.

Rainn Wilson Slams 'Girly' Rockers

Actor Rainn Wilson has blasted legendary rockers Black Sabbath and Led Zeppelin for wearing make-up and women's clothes - branding them too girly.

Patricia Heaton Slams 'Hooker' News Anchors

Sitcom star Patricia Heaton has launched a stinging attack on Los Angeles' female news anchors, claiming they dress like "hookers".

Mick Hucknall Slams Redhead 'Racism'

Simply Red star Mick Hucknall has branded those who mock redheads as "racist."

Christina Ricci Slams Drunk Stars

Actress Christina Ricci has criticized young stars who frequent the Hollywood party scene - insisting they all know their wild partying will be documented by the press.