Pictures of The Hills's Kristin Cavallari Wearing a Bikini in Vegas

Kristin Cavallari broke out her bikini yesterday to host a party at the Liquid Pool in Las Vegas's CityCenter. She covered up with a mesh shirt while posing for photos, then stripped down to her two-piece to sip drinks and play with water guns once inside. Kristin's following in the footsteps of her costar from The Hills, Heidi Montag, who showed off her post-surgery figure at a bash of her own two weekends ago. Heidi's transformed body and marriage to Spencer is still a hot topic for their MTV cast-mates, with Kristin saying, "It's not my body. If she's happy, that's all that matters. . . Nothing shocks me about them anymore. It's one thing after another."