Kelly Osbourne entered rehab in the spring of 2004 for her addiction to painkillers. In her SHAPE cover story, she says she believes her addiction was driven by self-esteem issues caused by the media's constant scrutiny over her weight. She's not the only celeb whose weight has fluctuated: See other celeb weight loss befores and afters
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See her dramatic transformation from MTV darling to VH1 Diva!
Kelly Osbourne Weight Loss
Photos: Kelly Osbourne Then and Now