Lauren Conrad's departure from The Hills apparently has co-star Spencer Pratt feeling like a ying without his yang.

"I'm actually very depressed," Pratt told E! News of Conrad's exit from the MTV reality show while attending Star magazine's Young Hollywood party at Apple Lounge on Wednesday night. "Who am I gonna beef out with? I gotta find some new enemy on the show."

Pratt, along with his "wife" Heidi Montag, have had more than their share of disagreements with Conrad on and off camera, particularly in regard to an alleged sex tape featuring Conrad that the couple insisted existed.

However, bickering between the two sides have seemed to cool in the months following a reunion between Montag and Conrad last October while they both dined at STK in Los Angeles.

Still, Conrad and her friend Lo Bosworth -- who were also at the Apple Lounge party -- apparently avoided a possible meeting with Pratt and Montag by skipping the red carpet and heading directly inside to a VIP table to watch Lady GaGa perform, according to E! News. After hanging out on the red carpet, Pratt and Montag did not go inside and left the party instead.

Pratt's sister Stephanie Pratt, former Laguna Beach star Kristin Cavallari, and Keeping Up With the Kardashians star Kourtney Kardashian all also reportedly attended the party.