Jennifer Lopez ran around NYC with her boyfriend Casper Smart yesterday. He was by her side for a stop by the Late Show, where J Lo chatted with David Letterman about her new reality show ¡Q’Viva! The Chosen. She cohosts the program with her soon-to-be-ex-husband Marc Anthony, so conversation between J Lo and David naturally moved toward the split. Jennifer said of shooting with Marc, "It’s fun, but it has its moments. The same things that . . . didn’t work sometimes come up." She and David also chatted about Jennifer's assorted fragrance lines, with David joking that one of her many scents is called "Separated but Still Friends." Jennifer is more than pals with current love Casper. He and Jennifer wrapped up the evening with a dinner at Cipriani, and after the meal, they headed back to their hotel together. Jennifer has a trip back to the West Coast in her future, once her Big Apple press duties are over. She's among the many presenters scheduled to appear at the Oscars on Feb. 26.