Most of the time being a Hollywood actor is all about the glitz and the glamour, but occasionally actors have to go that extra mile to transform themselves for a role. Take a look at some of the most dramatic actor transformations ever seen on film.
23 / 54
Vincent Kessler/Reuters
Natalie Portman is another actor who hasn't been afraid to alter her appearance more than once for movie roles, such as she did in 2005.