Chris Pratt, 33, may have gotten himself into shape to land the role as a baseball player in Moneyball, also starring Brad Pitt and Jonah Hill, but that's nothing compared to his bodily transformation for the new Zero Dark Thirty about the takedown of Osama bin Laden, directed by Kathryn Bigelow and also starring Jessica Chastain.

Chris Pratt

"I was about 50 pounds or 40 pounds lighter than I am now," Pratt said of his period filming for the role, since which time he has packed on the pounds to play what he calls "a fat and unhappy" character in an upcoming flick. "I worked out really hard and I cut out everything bad for me for a long time and I just focused on trying to become a believable Navy SEAL," Pratt, who is married to What's Your Number comedian Anna Faris, revealed.

For Pratt, keeping in character and not disappointing the real-life SEALs were his top priorities in filming Zero Dark Thirty. "I got to meet some of these guys through the course of making this movie," he said, reports E! Online. "It was just important for me not to embarrass them, you know, to create a character that was somewhat believable as a SEAL."

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