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Robert Pattinson riding a bike around Central Park on the set of Remember Me, and later standing with co-star Emilie de Ravin ... Shaquille O'Neal leaving his hotel in Midtown ... Mariah Carey filming the music video for her latest single, "Obsessed," including one scene with her dressed up dressed up as Eminem ... Leighton Meester, Chace Crawford, and Ed Westwick on the set of Gossip Girl ... and Rihanna walking into lunch yesterday at Philippe, and then turning up at the Gramercy Park Hotel last night for Allegra Versace's 23rd birthday party.