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Kristin Cavallari Out For Steamy Date Night with New Boyfriend Mark Estes

Kristin Cavallari's lookin' head over heels for her new man Mark Estes, holding hands and flashing sweet looks on their way to dinner in L.A. The happy couple strolled into Sugarfish -- a classy sushi joint in ritzy Beverly Hills ... and KC was dressed to impress, hot leather pants pulled up high.

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