David Katzenberg and Nicky Hilton Photos: Vanity Nightclub Las Vegas Birthday Party Pictures
David Katzenberg and Nicky Hilton Photos: David Katzenberg and Nicky Hilton arrive at Vanity nightclub located inside the Hard Rock Hotel and Casino on March 20, 2010 in Las Vegas, Nevada.
Hilton tossed a birthday party for her longtime boyfriend and his sister, Laura Katzenberg. The socialite and the Hollywood agent have been the subject of engagement rumors of late, with many speculating that a proposal might go down during their Sin City weekend.