"Real Housewives" Kelly Bensimon and Jill Zarin posing for a pic on the LES yesterday after having lunch at Little Giant ... Brooke Shields shopping downtown ... Celine Dion leaving Serge Normant at John Frieda Salon in the meatpacking district, and later stopping off at Dylan's Candy Bar with her son ... Steve Martin eating lunch yesterday at Via Quadronno on Madison Avenue ... Sarah Jessica Parker walking son James to school in the Village ... Cynthia Nixon's partner, Christine Marinoni, walking downtown ... Emily Blunt arriving at the studios of the Today show ... Taylor Momsen on the set of Gossip Girl in the meatpacking district ... Pete Wentz shopping with his son Bronx ... Kate Hudson leaving MTV in Times Square ... and Rihanna shopping at Fendi on Fifth Avenue.