Rabid fans were camping out in front of MoMA yesterday in expectation of Robert Pattinson’s appearance tonight at a premiere for his latest film, “Cosmopolis.” The star’s making his first public appearances this week amid the cheating scandal involving girlfriend and “Twilight” co-star Kristen Stewart. Yesterday morning, a spy told us, “They were talking about sending security out to deal with [the fans].” Gucci and the Peggy Siegal Company are hosting the premiere.