Audrina Patridge says it isn't difficult seeing her ex, Justin Bobby, lock lips with foe Kristin Cavallari on The Hills.

"At the end of the day, it's a show," Patridge, 24, told Usmagazine.com Thursday at MTV's Los Premios in Los Angeles Thursday. "It's entertainment. And you can't take anything serious on that show."

See how The Hills stars have changed

She and Cavallari, 22, clashed on the sixth season premiere because Cavallari pursued Bobby.

Asked if she and Cavallari have since ended their feud, Patridge told Us, "I don't know. I really don't know how it's going to play out. We still have three weeks of filming - and that's it."

See Kristin Cavallari's bikini body through the years

Patridge is getting ready to leave The Hills after this season to star in her own reality show, to be executive produced by Survivor creator Mark Burnett.

See what Krisin Cavllari and all the stars wore to the VMAs

"I'm an adult now, and I don't need all the petty drama and drinking and fighting," Patridge -- who just split from Aussie BMX racer Corey Bohan -- recently told Maxim. "I've done that, and I'm ready to move on."

Play Us' celeb sleuth game!

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly