Shocking, indeed! Some celebs seek out extreme methods to shed pounds, while others transform with the aid of healthier methods. From Rosie O'Donnell's and Jordin Sparks' respective 50 pound weight losses to Biggest Loser winner Rachel Frederickson's whopping 155 lighter frame, see before and after pictures of celebrities' weight loss transformations.
Jonah Hill 30 pounds
From Superbad to super-slim! Hill revealed his 30-pound weight loss before production began on 21 Jump Street back in 2011. "He got a nutritionist and a trainer," a pal told Us Weekly. "Now he looks better and feels better!"
Credit: Don Arnold/WireImage; Steve Granitz/WireImage