2. Charlize Theron

1-Charlize-Theron

The actress gained 30 pounds eating doughnuts, and was almost unrecognizable as a prostitute and serial killer in 2003’s Monster. She returned to her normal weight even before the film’s premiere. Theron, 38, who has said she is usually around a size 8 and likes her curves, went on to win the Golden Globe for Best Actress for the role.