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.
Randy Jackson 100 pounds
The longtime Idol judge and record company exec underwent gastric bypass surgery back in 2003 after finding out he had type 2 diabetes. "It's not easy, and it's a continued struggle,” Jackson said on the Today show in December 2008. "That's part of why I wanted to write the book [Body With Soul], as an inspiration to people and say, 'Hey, listen. It can happen to anybody. It happened to me, no matter how much money, no matter what I do, I'm still just like you.'"