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Actor Transformation

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Alexander Skarsgard is looking scarily gaunt these days — but thankfully, the 'True Blood' actor isn't sick. His skeletal appearance is all in the name of art; he's preparing for his role in the upcoming horror/thriller 'Hidden.' Skarsgard isn't the only actor to undergo a massive physical transformation for a film. Here are other actors that take "method acting" to a whole new level. [WENN; JKING/FAMEFLYNET PICTURES]

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Christian Bale took it upon himself to lose approximately 65 pounds for his role in 2004's 'The Machinist.' In the film, he plays a factory worker who tracks the decay of his body and mind as he struggles with insomnia. He reportedly achieved his skeletal look by subsisting on water, one apple or one can of tuna, and one cup of coffee a day. [WENN; Paramount Pictures]

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Charlize Theron put on 30 pounds to play prostitute turned serial killer Aileen Wuornos in 2003's 'Monster.' Prosthetic teeth and blotchy makeup helped complete the transformation. [WENN; Newmarket Films]

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Rapper 50 Cent dropped from 214 pounds to just 160 in the course of nine weeks to play a football player diagnosed with cancer in the 2011 film 'All Things Fall Apart.' [WENN; Twitter]

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In 2013's 'Hidden,' Alexander Skarsgard will play a man who takes refuge in a fallout shelter with his family during an outbreak. To prepare for the role, Skarsgard has shed some serious pounds, making him look dangerously gaunt. [WENN; JKING/FAMEFLYNET PICTURES]

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Ewan McGregor reportedly cut dairy and alcohol out of his diet for two months in order to slim down enough to play a heroin addict in 1996's 'Trainspotting.' [WENN; Miramax]

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To play John Lennon's assassin Mark David Chapman in the 2007 film 'Chapter 27,' Jared Leto gained a whopping 67 pounds. "[I did it by] eating everything you think you're not supposed to — pizza, pasta, ice cream, but my little trick was I would take pints of chocolate Häagen Dazs and put them in the microwave and drink them,” he told Starpulse. [WENN (2)]

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The already-slim actress Natalie Portman lost an additional 20 pounds to play a professional ballerina in 2010's 'Black Swan.' [WENN; Niko Tavernise/Fox Searchlight]

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In August, Matthew McConaughey began to lose weight to play an electrician who contracts HIV in 2013's 'The Dallas Buyer's Club.' McConaughey told E! Online he wanted to lost a total of 30 pounds before shooting began in September. [WENN; Enrique RC/Pacific Coast News]

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Renée Zellweger put on approximately 30 pounds to play Bridget Jones — twice. She first gained the weight in 2001 for 'Bridget Jones' Diary' and then again in 2004 for 'Bridget Jones: The Edge of Reason.' [WENN; Universal Pictures]

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Matt Damon put on 30 pounds for his role in the 2009 film 'The Informant.' Damon told Access Hollywood, “It was very, very easy to gain the weight. Very, very fun … I just basically ate everything I could see for a few months.” [WENN; Warner Bros. Pictures]

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To play Lisbeth Salander in 2011's 'The Girl With a Dragon Tattoo,' who is described in the novel as looking 'anorexic,' Rooney Mara had to slim down her already-tiny frame. She also got a number of piercings for the role, including four in each ear and one in her eyebrow, nose, and lip. [WENN; Columbia Pictures]

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To play Chuck Noland in 2000's 'Castaway,' Tom Hanks had to first gain weight, and then lose it again. He packed on the pounds for the early scenes, and then production was halted until Hanks could lose 50 pounds and grow a grizzly beard. [WENN; 20th Century FOX]

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