Some stars go to great lengths to get into character. Matthew McConaughey, Anne Hathaway, Renee Zellweger, and Christian Bale are just a few of the many celebrities who've lost or gained significant amounts of weight for movies
Mila Kunis in Black Swan
After dieting down to a pin-thin 95 pounds for 2010's Black Swan, the That '70s Show alum struggled to get her curves back. "My shape is different. When I got down to 95 pounds, I was muscles, like a little brick house, but skin and bones," she told Harper's Bazaar. "When I gained it back, it went to completely different areas. All the weight that left my chest went to my side hip, my stomach...I'd be happy if my ass got bigger."