Kelly Osbourne checked into rehab for the third time in five years in early 2009, and she's now admitting she'd been addicted to painkillers since she was just 13 years old.

Chris Pizzello, AP

No, things are not A-OK with Norman Cook, aka Fatboy Slim, who has entered rehab to treat alcoholism. The 'Weapon of Choice' mastermind has made no secret of his love of drinking. He once remarked that the only difference between himself and his alias Fatboy was "a bad Hawaiian shirt and a bottle of vodka."

Gareth Cattermole, Getty Images

Actress Tara Reid checked herself into Promises in December, the popular-with-celebrities rehabilitation center, to treat alcohol addiction.

Kevin Winter, Getty Images

Former Guns N' Roses drummer Steven Adler ended his 'Celebrity Rehab' run, and a day after the final episode aired, he was ordered to attend a state-sanctioned rehab center in order to avoid jailtime.

Michael Bezjian, WireImage

Mackenzie Phillips went back to rehab after pleading guilty to cocaine possession stemming from her arrest at the Los Angeles airport in August. The actress has battled drug addiction since her days on 1970s sitcom "One Day at a Time."

Michael Buckner, Getty Images

Colin Farrell recently talked with a BBC show about his five-week stint in rehab in 2005 for drugs and alcohol. He says before seeking treatment, he "was dying."

Amy Sancetta, AP

David Duchovny is seen walking in New York City in October, just days after leaving rehab, where he was treated for sex addiction.

Asadorian-Mejia, Splash News

Tatum O'Neal entered rehab following her June drug bust and now says the arrest saved her from relapse.

Jemal Countess, WireImage.com

Amy Winehouse has made several rehab attempts over the past two years. Sadly, none have seemed to stick with the 'Rehab' songstress.

WENN

Comedian, actor and Howard Stern sidekick Artie Lang, seen performing his stand-up in 2008, entered an outpatient rehab program after years and years and years and years and years and years and years of hard partying.

Ethan Miller, Getty Images

LOS ANGELES, CA - MARCH 13: Singer Kelly Osbourne attends the Lady GaGa performance at the Wiltern Theatre on March 13, 2009 in Los Angeles, California. (Photo by Michael Buckner/Getty Images) *** Local Caption *** Kelly Osbourne

Getty Images

LOS ANGELES, CA - MARCH 13: Singer Kelly Osbourne attends the Lady GaGa performance at the Wiltern Theatre on March 13, 2009 in Los Angeles, California. (Photo by Michael Buckner/Getty Images) *** Local Caption *** Kelly Osbourne

Getty Images

(L-R) Ozzy Osbourne, Kelly Osbourne, Jack Osbourne and Sharon Osbourne arrive at the Fox winter All-Star party held at My House on January 13, 2009 in Los Angeles, California.

Jean-Paul Aussenard/WireImage.com

TV personality Kelly Osbourne arrives at the Fox winter All-Star party held at My House on January 13, 2009 in Los Angeles, California.

Jean-Paul Aussenard/WireImage.com

LOS ANGELES, CA - JANUARY 13: Singer Kelly Osbourne attends the 2009 Fox Winter All-Star Party at My House on January 13, 2009 in Los Angeles, California. (Photo by Kevin Winter/Getty Images) *** Local Caption *** Kelly Osbourne

Getty Images

LOS ANGELES, CA - JANUARY 13: (l-r) Sharon Osbourne, Jack Osbourne, Ozzy Osbourne and Kelly Osbourne attend the 2009 FOX Winter All-Star Party held at My House on January 13, 2009 in Los Angeles, California. (Photo by Frank Micelotta/Getty Images for FOX) *** Local Caption *** Kelly Osbourne;Ozzy Osbourne;Jack Osbourne;Sharon Osbourne

Getty Images for Fox

LOS ANGELES, CA - JANUARY 13: (l-r) Kelly Osbourne, Chairman, Entertainment FOX Broadcasting, Peter Liguori, Sharon Osbourne, Ozzy Osbourne and Jack Osbourne attend the 2009 FOX Winter All-Star Party held at My House on January 13, 2009 in Los Angeles, California. (Photo by Frank Micelotta/Getty Images for FOX) *** Local Caption *** Jack Osbourne;Ozzy Osbourne;Sharon Osbourne;Kelly Osbourne;Peter Liguori

Getty Images for Fox

LOS ANGELES, CA - JANUARY 13: (l-r) Kelly Osbourne, Chairman, Entertainment FOX Broadcasting, Peter Liguori and Sharon Osbourne attend the 2009 FOX Winter All-Star Party held at My House on January 13, 2009 in Los Angeles, California. (Photo by Frank Micelotta/Getty Images for FOX) *** Local Caption *** Sharon Osbourne;Kelly Osbourne;Peter Liguori

Getty Images for Fox

LOS ANGELES, CA - JANUARY 13: (l-r) Sharon Osbourne, Jack Osbourne, Ozzy Osbourne and Kelly Osbourne attend the 2009 FOX Winter All-Star Party held at My House on January 13, 2009 in Los Angeles, California. (Photo by Frank Micelotta/Getty Images for FOX) *** Local Caption *** Kelly Osbourne;Ozzy Osbourne;Jack Osbourne;Sharon Osbourne

Getty Images for Fox

Kelly Osbourne arrives at Flaunt Magazine

Michael Bezjian/WireImage.com