<p>FRISKY First Daughter Barbara Bush put on a belly-dancing show at Chelsea hot spot Viscaya early yesterday while imitating the undulating tummy of a sword-twirling Japanese dancer named Yoko. Bush jumped up and joined Yoko at the socialite-studded after-party for Jennifer Nicholson's fashion show, prompting partygoers to throw flowers and hundreds of dollars in cash at the feet of Bush and Yoko. Commenting on the trays of margaritas and Veuve Clicquot champagne delivered to Bush's table before her gutsy performance, one wag quipped, "I hope the Secret Service is driving her home." Socialites Amanda Hearst, Elisabeth Kieselstein-Cord and Tinsley Mortimer hosted the "Magic Carpet Ride"-themed bash and post-show supper at adjoining restaurant Sette. The glammy guests included Ivanka Trump (hand-in-hand with Q-Tip heir and "Born Rich" director Jamie Johnson), Muffie-Potter Aston, Somers Farkas, Kimberly Stewart and Robert De Niro's ex-wife, Grace Hightower. Nicholson, the thirtysomething designer daughter of Jack Nicholson, also showed off her boy toy, 24-year-old Warren Hode, the sole male model in her show.</p>