It looks like series regular Audrina Patridge is not going to get along very well with Hills newcomer Kristin Cavallari.

Lauren Conrad will bid farewell to The Hills this week, but producers of the wildly-successful reality drama wasted no time manufacturing a new catfight to replace the thick tension between Lauren and former bestie Heidi Montag.

Meow!

“I don’t like her,” Audrina confessed in an interview with On-Air With Ryan Seacrest on Thursday.

Audrina — who is reportedly dating Star Trek actor Chris Pine — says the girls sparred will filming a few scenes together earlier this month, but was mum on exactly want started the war of words, simply telling Ryan, “When someone gets in my face, I have to defend myself. And, you guys, I mean, I can’t say much. They’ll show it, but I mean, all I have to say is, it’s really pathetic and desperate what people will do when the cameras are around.”

“It was my birthday, and I was like, Oh, my God. Is this what we’re going to have to deal with?’” she added.

Listen To Audrina’s Chat With Ryan Seacrest