It was a star-studded affair last night at Millions of Milkshakes in Los Angeles, California, as Heidi Montag , Spencer Pratt , Perez Hilton, and the Kardashian sisters all showed up. The iconic ice cream shop was brimming over with paparazzi as the “Hills” hotties did their thing, concocting their own signature milkshake.

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Kardashian Sisters Team Up with Heidi and Spencer