3. Charlize Theron
Charlize Theron is another actor that is willing to go all-out for a role. In Mad Max, Charlize had to change into a rough warrior of the road. And she made this role more believable with her head completely shaved off. Theron has also completely changed her looks for the movie Monster. She had to gain more than 30 lbs and undergo extensive makeup along with changes in mannerisms and attitude to justify her role as Aileen Wournos, a notorious serial killer. But her efforts have not gone in vain, and Charlize stands out among the leading actresses in Hollywood today.