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Mischa Barton arriving at JFK, and walking into the Mercer Kitchen in SoHo a few hours later ... Emile Hirsch getting out of an SUV in Times Square ... Leighton Meester walking to the Gossip Girl set in Central Park ... Katy Perry going shopping in the meatpacking district ... Ashley Tisdale arriving at JFK with her dog in tow ... Hugh Jackman walking with his kids Oscar and Ava in the West Village ... Drew Barrymore and Christina Applegate shooting scenes for Going the Distance ... Russell Brand getting out of a taxi in the meatpacking district ... and Rihanna going to dinner at Cipriani Wall Street.