Happy Birthday Kristin Cavallari!

The former Laguna Beach star marked the rite of passage at Luxor's LAX nightclub, where she danced to Soulja Boy and hung with friends. "My first official drink was Grey Goose and soda," she said. "It's really exciting. I can go to the clubs and not worry about anything." She was joined by fellow Laguna Beach alum Alex Murrel, and spent the night chatting up former flame Matt Leinart, who