The New York Post reports Damon Dash refused to tip staff at the former Moomba space on Seventh Avenue South after he and his pals drank $4,000 worth of Cristal at his birthday bash on Saturday night. “He scoffed when we asked him if he’d take care of us,” a waitress said. A bartender reports Dash “was appalled” when asked to tip. “Damon never ordered those bottles himself, and doesn’t know anything about it,” insists Dash’s rep. “If that is indeed the truth, that’s something he’ll be looking into.” Partying with Dash were Jay-Z and Destiny’s Child star Beyonce Knowles, Mariah Carey, and Sean ‘P. Diddy’ Combs.