Kristin CAVALLARI doesn't NEED a MAN!

Kristin Cavallari is just too busy to have a boyfriend.Looking phenomenal in a short aqua off-the-shoulder jersey dress and four-inch silver heels, the former Laguna Beach star attended the Ciroc Vodka Big Brothers Big Sisters DJ Irie benefit dinner at Miami's Gansevoort Hotel Saturday night with two girlfriends."What love life?" Cavallari, 21, said to PEOPLE. "I'm so busy." She added that she is "single and not looking for a boyfriend."Busy indeed! Cavallari just finished shooting Wild Cherry, a film with Rumer Willis and Rob Schneider, in Canada. She said it was "great" to film with Willis and pronounced Schneider "so funny." She also just shot a music video with Gavin DeGraw and a short film by Kevin Connolly.Cavallari's not the only Laguna Beach veteran to be finding success. Her Hills pals are making their mark in film and fashion and music, which she thinks is great: "I'm so happy for them."