03/30/2010 AT 12:00 PM EDT
may have a new guy
– singer Ryan Cabrera
– but she was staring at her ex Justin Bobby
during a recent night at L.A. nightspot Voyeur. "She was trying to act like she didn't care," an onlooker says. Patridge also busied herself with her phone, texting as she danced. Justin Bobby, meanwhile, was snuggling in a corner with Lindsay Lohan
– and the two were doing some major flirting, the onlooker says. Also there: Ryan Phillippe
, who was seeking out female attention.