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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Thanks to physical roles in movies such as "Invictus," "Green Zone" and the "Bourne" movies, Matt Damon has become known for his fit physique. But he has shown the willingness to change that up for roles.