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Looks like someone's having a blast hanging with the boys on set!

Over the weekend Kristen Stewart shot scenes for Camp X-Ray in Los Angeles, and the 23-year-old starlet looked right at home in her army fatigues. She's not exactly a glamour puss, so we're guessing she's loving the fact that she doesn't have to wear a dress or heels for her role in this film.

This is K. Stew's first movie since Twilight: Breaking Dawn Part 2, and she'll play a U.S. solider stationed at Guantanamo Bay who strikes up an unlikely relationship with an inmate.