Actresses Who Gained Weight For Movies

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Michelle Williams is earning raves (and tons of Oscar buzz) for her performance as Marilyn Monroe in the upcoming film My Week with Marilyn. And talk about dedication to your craft: Since the tiny actress doesn't quite have Marilyn's legendary curves naturally, she packed on a few pounds for the role. "I wasn't watching what I ate, let's put it that way," Williams, 31, told People magazine at the movie's New York premiere (it hits theaters this Wednesday).

But the transformation didn't stop there. Williams watched Monroe's movies non-stop, studied her voice and perfected her famous wiggle, which she practiced by tying a belt around her knees, according to Newsweek. She also had to bleach her hair every few days, so it wouldn't show under her blond wig, and spent hours in makeup each day. The finished product? Bravo! Williams morphed into Marilyn with uncanny results (based on the sneak peek in the trailer). But she's not the first actress to gain weight for a role — and look hot doing it. Here are four more stars who looked even sexier with a little more meat on their bones.