06/08/2011 AT 06:00 AM EDT
sipped on a glass of red wine while sharing an animated chat with Hills
alum Stephanie Pratt
at a fundraising event for Generosity Water in Las Vegas. The Dancing with the Stars
pro swayed to the music while snacking on tray passed hors d'oeuvres. Later in the evening, Burke flirted with a handsome, dark-haired partygoer, and the twosome got cozy in a poolside cabana.