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A newly unengaged Uma Thurman heading into an office building (and avoiding questions by waiting paparazzi) ... Ashlee Simpson and Pete Wentz walking downtown with their son Bronx ... Sienna Miller hailing a cab downtown ... Jessica Szohr walking to the Gossip Girl set on Central Park West ... Naomi Watts pushing son Sasha in his stroller in SoHo ... Kim Kardashian arriving at Fox News ... Jessica Simpson leaving the Ritz-Carlton with Billy Corgan ... Chris Brown leaving MTV ... and Taylor Swift walking into Otto to have dinner.