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.
Jason Segel 35 pounds
The Five-Year Engagement star said he was "forced to lose weight" for his role opposite Emily Blunt in the 2012 movie. "I was told that it had to be conceivable that Emily Blunt would ever choose me to be her husband," Segel told David Letterman in an April 2012 interview. A little over a year later, Segel attributed his steady weight loss to "living healthy, exercising, eating right." He added to Us, "No more midnight pizzas," Segel told Us Weekly in July 2013 of his weight loss.