Alicia Silverstone riding the subway and listening to her iPod ... Vincent D'Onofrio hailing a cab in SoHo ... Ryan Reynolds walking downtown ... Nick Cannon and Mariah Carey leaving a building together .. Amber Rose shopping in SoHo with a friend ... Natalie Portman and Mila Kunis on the set of their new movie, Black Swan ... Tara Reid arriving at MTV studios in Times Square ... Taylor Swift getting ice cream with Emma Stone at a Baskin Robbins on Wednesday night ... Celine Dion signing autographs outside her hotel ... and Young Jeezy posing for pictures with a fan on the street.