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1. Charlize Theron
For the movie Monster, Theron went through such an amazing transformation that she was barely recognizable. Sure, a lot of it had to do with the makeup, but her body was completely different as well. The slim model had to gain 30 pounds for the role and did so by eating a lot of doughnuts.
She played a serial killer prostitute and really looked the part after putting on the weight. However, Theron has a strong work ethic and was able to shed the pounds even faster than she put them on. In fact, even before the film had its official debut, she was back to her skinny self.
The sacrifice paid off because Theron won a Golden Globe award for Best Actress for this role. And naturally, she was at the awards show to accept it in her regular sized dress and looking as trim and gorgeous as ever.