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Most dramatic actor transformations

Published On: Oct 16 2012 02:53:40 PM CDT   Updated On: Jan 23 2014 08:57:57 AM CST

Matthew McConaughey and Jared Leto are receiving buzz during awards season for their dramatic transformations in "Dallas Buyers Club." Take a look at some of the other most dramatic actor transformations ever seen on film.

dramatic movie transformation - Portman 2
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Fox Searchlight Pictures

But Portman went even further, in a way, for her Oscar-winning role in 2010's "Black Swan." Months before director Darren Aronofsky's psychological drama went into production, Portman was dieting, working out and dancing to the extreme, all in an effort to get the tiny and frail, yet flexible and strong body ballerinas are known for.

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