The music moguls kick off an N.Y.C. event with a show of solidarity. Plus: Brad & Angelina, Mary-Kate Olsen and more

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ON THE TOWN

Brad Pitt escorts Angelina Jolie (sans their ever-present brood) Tuesday to the New York premiere of his film The Assassination of Jesse James by the Coward James Ford. When asked if she was nervous for Pitt on his big night, Jolie told PEOPLE, "We only get nervous when it's about important things like family."