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.
Bravo Stars Gather for Andy Cohen's Book Bash
•May 16, 2012
The stars of Bravo come out to celebrate their boss Andy Cohen's new biography.