Tinsley Mortimer‘s family can’t stop getting into trouble. Her father, George Mercer, and his girlfriend, Krissy Morrow, were booted from the Plaza Hotel during Michael Fredo‘s jazz set the other night. A witness relates, “Mercer drunkenly stumbled onto the stage and yanked the microphone from Fredo to sing his version of ‘New York, New York.’ The Plaza security guards marched up the marble steps to the Rose Bar and grabbed Mercer, no questions asked.” This was in front of a horrified crowd that included Martha Stewart, Betsey Johnson, Isaac Mizrahi, Courtney Love and Woody Allen. The incident occurred a few days after a catfight at his apartment, first reported by Page Six, between Morrow and Mercer’s ex-wife, Dale, over money.