In the Season Four premiere, Lisa Vanderpump vows to take SUR restaurant to new heights. Scheana throws a costume party for her 30th birthday, but when Kristen shows up Ariana and Sandoval accuse Scheana of being a fake friend. James's reckless behavior threatens his DJ career, Schwartz realizes he's ready to commit to Katie, and a visit from Jax's mother offers rare insight into his life before SUR.

When Scheana and Katie bust Lala for lying about a modeling job in Italy, Lisa Vanderpump turns the table on them for picking on the new girl. Scheana worries her marriage may be in danger when it's revealed that her husband has been keeping secrets. Tom and Ariana try "adulting," Jax and James compete for Lala's affection and Tom Schwartz makes a big step towards committing to Katie.