Jason Webber/Splash News Online
05/03/2010 AT 02:00 PM EDT
, 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 new flame Justin Bobby
, just inches away from his ex, Patridge. The entire group also watched as the birthday boys were presented with two colossal Crumbs cupcakes.