Schwartz tries to make peace between Ariana and Stassi, but Katie gets annoyed when Ariana refuses to play nice. Meanwhile, James is excited to play his biggest DJ set since being fired from SUR, but the gig is ruined when Jax, Scheana, Kristen and two alleged mistresses ambush James to expose his cheating ways. Finally, Lisa gives Katie valuable wedding advice and Schwartz gets his prenup, only to learn that he doesn't have much to protect.