Lisa tries to wish Peter a happy 30th birthday, but when Scheana gives Peter an inappropriate lap dance, Katie and Kristen pick a fight and run Scheana out of the party. Stassi accuses Jax of being a sex addict, only to learn that Jax may have slept with one of her best friends.

When The Real Housewives of Beverly Hills gather for a dinner party at SUR, Stassi and Jax witness firsthand that Lisa's high-class friends can be just as spiteful and vicious as their own. Kristen's obsession over rumors that Tom is hooking up with the pretty new bartender leads to a five-girl shouting match on the night of Lisa's dinner.