Ask any new mom: The first day back on the job after maternity leave is a killer. But when your career involves drop-kicking bad guys and dangling from the side of a 10-story building, the transition is a little more jarring. So it's not surprising that last February, after taking 18 months off to be with her twins Knox and Vivienne, Angelina Jolie arrived on the New York City set of the political thriller Salt feeling out of sorts. "It felt a little strange to be back," she tells PEOPLE, laughing at the memory. "I kept thinking, 'I'm not an action star; I'm somebody's mom. What am I doing here?'"
Make that six little somebodies-all under the age of 9. Not that juggling motherhood and movie stardom has ever appeared to be too tough for Jolie, 35, who also has the benefit of homes around the world, private planes and a flexible work schedule. But the star says what truly keeps her life in bala...
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