Audrina Patridge, Kristin Cavallari, and Heidi Montag were together in LA yesterday as they shot for the next season of The Hills. Heidi was busy earlier in the week filming her cameo for Jennifer Aniston's Just Go With It, looking absolutely thrilled to be on set. Even though she wasn't grinning ear to ear while working on her small-screen series, Heidi still got down to business and shared a toast with Audrina. Kristin raised a few eyebrows herself when she was spotted with a ring on her left ring finger, but she's evidently not engaged — get her look here. Audrina and Ryan Cabrera, meanwhile, seem to be going strong, but we'll have to wait until their show returns to see what their relationship is all about.
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