Check out these remarkable movie makeunders
The former model gained weight and spent hours in makeup to become real-life Aileen Wuornos, one of the few female serial killers, in Monster (2003). "It was about getting to a place where I felt closer to how Aileen was living," Theron has said of the look. She won 2003's Best Actress Oscar.
Credit: Newmarket Releasing/Courtesy Everett Collection