At Mokai Friday night: Paris and Nicky Hilton, Stavros Niarchos and Brandon Davis, dancing on couches and guzzling Patron Tequila. On Saturday night, Paris was two hours late to her sister's charity event for the Danielle DeMarzo Foundation at Thomas Kramer's Star Island manse. "She didn't want to get into the Hummer limo sent for her," says our source. "She had a hissy fit and refused to get into the car." When she did arrive, with Niarchos ,she was sporting flip flops due to a broken toe which didn't stop her from dancing at Mokai again later that night.