Kristin Cavallari and Justin Bobby got cozy yesterday while filming The Hills in LA before she headed off to dinner in a leather jacket. He provided a little protection from the elements, though he wasn't there to help her when she got soaked after getting hit in the face with a water balloon. Things have been heating up between Kristin and JB on their show — but as Stacie the bartender alluded to us at the MTV VMAs, a third party might soon be raining on Kristin and Justin's parade.

To see more photos of Kristen and Justin just