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Updated: Tue, 28 May 2013 16:00:00 GMT | By Colleen Last
Before and after: stars who've bulked up

Colin Farrell

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Colin Farrell showed he'd been hitting the gym when he stepped out in Hollywood in a sleeveless top, exposing his bulging muscles. His heart tattoo, which mum Rita's name inside, was also visible.

Check out other celebrities who've bulked up, and take a peek at what they looked like before they hit the gym...