Kristin Cavallari and Audrina Patridge filming The Hills in West Hollywood 1/13

On-screen frenemies Kristin Cavallari and Audrina Patridge spent the afternoon filming The Hills at a cafe in West Hollywood this afternoon (January 13).
The unlikely pals seemed to be getting along famously — even despite a well-documented history of battles — as they laughed and joked over glasses of water with lemon.
Perhaps the reality TV starlets were discussing co-star Heidi Montag’s recent plastic surgery unveiling!
Meanwhile, after getting snapped repeatedly at the gym, Kristin is opening up about the circuit training that she’s currently taking.
Claiming that it “kicks your ass,” the blonde babe tells Us Weekly: “I never want to go and I walk out dripping in sweat and it kills you, but it works. And I feel good… This is the first time in my life where I’ve really been working out consistently.”
As for what motivated Kristin to get her body into shape? “Once you see results, you want to maintain them and you want to keep it going and that makes you want to go to the gym,” she says.
credit - faded youth

Audrina tweeted this afternoon: "first day of filming the hills!!