The Hills Cast Filming at Sylvain Bitton And JT Torregiani's Birthday Celebration

Spotted: Audrina Patridge, holding hands with beau Ryan Cabrera at Les Deux, where the Hills star celebrated the club owners' birthdays along with her castmates. Nearby, Kristin Cavallari chatted up her Justin Bobby just inches away from his ex, Patridge.

LOL @ Brody checking out Audrina's chest!
Click here to see two more photos from this event.

credit - wire image, profimedia, People Magazine
~Kelli at Hills Freak

Lo Stephanie and Holly at Sylvain Bitton And JT Torregiani's Birthday Celebration

Stephanie Pratt and Lo Bosworth and Holly Montag at Sylvain Bitton and JT Torregiani's birthday celebration at Les Deux on April 28, 2010 in Los Angeles

credit - wire image
~Kelli at Hills Freak