Audrina Patridge has confirmed recent rumors that she's in the midst of a cat fight with The Hills co-star Lauren Conrad.

Patridge claims she and Conrad got into an argument when Conrad recently returned to their shared apartment to find Patridge participating in an exclusive OK! Weekly photo shoot and interview, the magazine reported in its June 23 issue.

"She was very, very, very mad," Patridge told OK! Weekly. "She said it's her house. But this is my room. I said, 'We're not taking pictures of your house -- don't be rude.' It just adds to the tension. Now she thinks I'm sneaky and shady for doing this photo shoot, yet she and her team knew about it. She won't let it go."

Patridge and Conrad have been roommates for a little more than a year, when Heidi Montag moved out because Conrad didn't approve of her dating current fiancee Spencer Pratt.  Montag and Conrad continue to be sworn enemies.

It remains to be seen if Patridge and Conrad's recent riff will have the same ramifications as that one did -- but if it's any indication, Patridge recently relocated from the apartment to its back house.

"[It's] much harder," she told OK! about living in the back house.  "If I'm in my pajamas and it's cold outside, I don't want to run across the yard into the house. But we make it work."

The Hills third season recently ended with Conrad spending more of her time with Lauren "Lo" Bosworth instead of Patridge, with Bosworth moving into the aforementioned apartment.

MTV is currently filming The Hills' fourth season, which is scheduled to debut in August.