8. Jared Leto dropped tons of weight for his role in Requiem For A Dream, but also knows how to gain weight too! He went from hunk to chunk to play Mark David Chapman in Chapter 27.
10. Renee Zellweger got good at gaining weight for the Bridget Jones franchise! The usually skinny star chunked up for both installments of the film, and is in talks for a third.
Stars Who Have Transformed Their Bodies For Movie Roles
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 Anne Hathaway was forced to drop a whopping 16 pounds from her already tiny frame for her role as a prostitute in Les Miserables, hitting the set looking incredibly gaunt. Photo: Getty Images/FameFlynet
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Natalie Portman’s scary skinny ballerina body in Black Swan helped earn her an Academy Award, but heath experts were concerned about her dramatic weight loss. Photo: WENN
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Chris Hemsworth majorly buffed up for his role as superhero Thor. Photo: FameFlynet
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Christian Bale is an old pro at getting emaciated. After shedding massive amounts of weight for The Machinist, he went on to diet again for his Academy Award wining role in The Fighter. Photo: FameFlynet
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Stars Who Have Transformed Their Bodies For Movie Roles
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 George Clooney packed on the pounds for his Academy Award winning role in Syriana. Photo: WENN
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Gerard Butler became an international star after buffing up for his role in 300, but the hunky Scottish can also lose weight too! He recently slimmed down to play a surfer. Photo: FameFlynet
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Hilary Swank packed muscle onto her svelte figure for Million Dollar Baby – and it paid off. She won an Oscar for the role. Photo: WENN
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Jared Leto dropped tons of weight for his role in Requiem For A Dream, but also knows how to gain weight too! He went from hunk to chunk to play Mark David Chapman in Chapter 27. Photo: Twitter
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Kate Bosworth skyrocketed to fame in Blue Crush, a role she gained weight and muscle tone for. She slimmed back down right after, spawning eating disorder concern. Photo: WENN
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Stars Who Have Transformed Their Bodies For Movie Roles
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 Renee Zellweger got good at gaining weight for the Bridget Jones franchise! The usually skinny star chunked up for both installments of the film, and is in talks for a third. Photo: Getty Images
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