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Kathy Hilton, Kyle Richards

Vanderpump's co-star Kyle Richards brought her big sister Kathy Hilton (yes, Paris' mom) to the soiree. Her other sister, Kim, is also a "RHoBH" castmate, but she was not in attendance on Monday night. (5/14/2012)

Bravo Stars Gather for Andy Cohen's Book Bash

The stars of Bravo come out to celebrate their boss Andy Cohen's new biography.