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.
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Warner Bros. Pictures
More than a decade later, Damon again underwent a transformation for a role, this time packing on the pounds for Steven Soderberg's 2009 movie "The Informant!" This time around, Damon added weight through a diet of pizza, burgers and beer.