PerezHilton.com says Heidi Montag has been spending time with Lauren Conrad's best friend, Audrina Patridge.
"Audrina and LC are going through a rough patch in their relationship," a source close to the pair tells Perez. "Audrina feels like [Laguna Beach alum] Lo Bosworth is trying to squeeze her out of the picture. There's a lot of tension there. Audrina has been going to Orange County almost every weekend to get away from Lauren."