These actors showed true dedication to their art when they dramatically altered their appearance for movie roles.
1. Christian Bale
Christian is a repeat offender of altering his body shape for movie roles. In 2004 Christian lost 62 pounds to play the lead role in The Machinist and just last year he put on a significant amount of weight to play Irving Rosenfeld in American Hustle.
2. Mila Kunis
Mila lost 20 pounds for her acclaimed role in the haunting Black Swan where she played a professional ballerina.
3. Jared Leto
Similarly to Christian Bale, Jared Leto has dramatically transformed himself more than once. He piled on 67 pounds to play Mark David Chapman in Chapter 27. More recently, he went down to a shocking 114 pounds for his Oscar winning role as Rayon in Dallas Buyers Club.
4. Charlize Theron
Charlize was almost completely unrecognisable as Aileen Wuornos in Monster. She wore prosthetic teeth and gained 30 pounds for the role.
5. Renée Zellweger
Renée is best known as the beloved Bridget Jones. At the time of casting, Renée was a controversial choice as she was skinnier that Bridget is described in the original books and she is American. However, she quickly proved the critics wrong as she gained 20 pounds and developed an impressive accent.