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.
Kelly Osbourne 42 pounds
"I took more hell for being fat than I did for being an absolute raging drug addict," Osbourne, who checked into rehab for addiction three times prior, told Us Weekly in February 2010. "I will never understand that." To shed 42 pounds, Osbourne did it the healthy way -- regular exercise and a portion-controlled diet. "I'm really proud to look in the mirror and not hate every single thing I see," the E! host told Us. "I no longer think, Why don't I look like this girl or that girl?"