Tom Schwartz finally mans up and plans to get down on one knee for Katie, but Lisa Vanderpump worries that his complicated proposal scheme will end in disaster. Brittany moving in with Jax doesn’t stop him from moving in on Lala. Ariana’s attitude drives Scheana and Katie closer to Kristen, Sandoval tries to correct a huge mistake, and Kristen and James get left out in the cold when the SUR crew plans a tropical vacation.