Britney Spears and Kevin Federline were both in Las Vegas Friday night, but didn't hang out. Federline nabbed a Father of the Year Award at club Prive, while Spears chilled with her dad Jamie and an assistant at the Cinevegas party at Palms Place. Spears, 26, sipped just water while sitting in a poolside cabana, according to an eyewitness. She departed at 12:20 a.m. Saturday morning, after spending about an hour and a half there. Meanwhile, across town, Federline was shocked at his Father of the Year award. "I'm surprised," Federline said when asked how it felt to win the title. Federline, 30, hit up the club with a group of male pals,” including divorce attorney Mark Vincent Kaplan  just before 1 a.m. Saturday morning. Federline,” also named a Power Player last year,” had a quiet night at the club, chilling with friends and pumping his fist into the air when Timbaland's "The Way I Are" was played by the DJ. Prive presented Federline his Father of the Year trophy "someplace quiet" at the dad-of-four's request, so clubgoers didn't see the ceremony, according to a source. He was gone by 3:15 a.m.

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