From Kelly Osbourne to Christina Aguilera, we're reviewing Hollywood's biggest weight gainers and losers.
Kelly Osbourne has slimmed down to a reported 112 pounds after shedding 50 -- a task she credits to Dancing with the Stars partner Louis Van Amstel.
"He got me eating right; he got me working out," said Osbourne. "He taught me how to love myself."
While Kelly has been congratulated on her weight loss, some stars have been criticized. One such celebrity, LeAnn Rimes, was accused of losing too much weight -- a point she argued against on Chelsea Lately.