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.

Lisa Vanderpump and the SUR crew force Scheana to reassess her marriage. Jax campaigns to get his new flame a job at SUR, even while things heat up between him and Lala. Sandoval and Schwartz pitch Lisa a business plan. Kristen and James seek couple's therapy.

Convinced that Kristen is cheating on him, James seeks revenge by hooking up with Lala. Lisa schools her staff on fine wine, Katie and Ariana urge Scheana not to sweep marital problems under the rug, Peter chops his ponytail, and a jealous Jax recruits Kristen in his scheme to pull Lala away from James.

Lisa treats a group of underprivileged kids to the full SUR experience, including a serving of bad behavior from her staff. Jax stands up for Kristen when her break up with James turns ugly. Ariana's mood sours when Sandoval contemplates going to Vegas without her, Schwartz and Sandoval fail to impress with their business plan, and Jax asks Brittany to move in with him.

Ariana reveals the emotional reasons why she wants Tom Sandoval to stick around after her birthday. Lisa advises the girls to get back at their boyfriends for going to Vegas, so Lala, Katie and Ariana kiss and make up at Scheana's sleepover. Jax, Schwartz and Sandoval strive to be loyal, but struggle to keep their pants on in Sin City.

Sandoval and Schwartz learn that not all that happens in Vegas stays in Vegas when they surprise their girlfriends with shocking news from their trip. Kristen returns to SUR and apologizes to Ariana, but Ariana is not ready to forgive and forget. Sandoval and Ariana take the stage at the Improv, James tries to sabotage Jax's love life, and a visit from Sandoval's mom sheds light on his pre-SUR life.

Tom Schwartz finally plans to get down on one knee for Katie, but Lisa Vanderpump worries that his 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 mistake, and Kristen and James get left out when the SUR crew plans a tropical vacation.

Stassi has been sniffing around SUR, but Lisa Vanderpump wants her to keep her distance. Scheana and Ariana discover that their friendship may be more damaged than they ever knew. With the SUR crew headed to Hawaii for Jax and Tom's birthdays, James plots to get invited on the trip. Kristen attempts to make peace with Sandoval, newly engaged Katie takes her engagement ring on a victory lap at SUR, and Faith and Lala skinny dip in the most unlikely of places.

The SUR gang travels to Hawaii to celebrate Jax and Tom's birthdays, bringing their conflicts with them. Lala tries to come clean about her flirtation with Jax, but Jax refuses to accept any blame. Tom discovers Scheana sent negative texts about him to Ariana's mom. Katie lashes out when Lala skinny dips in front of Schwartz, and Lisa Vanderpump frets over Max from 3,000 miles away.

While the SUR crew parties in Hawaii, Stassi visits Kristen in LA and finally reveals the truth about her sex tape. Ariana rejects Scheana's fake apologies, and Tom strikes back with an attack on Scheana's marriage. Lala kicks James out of bed for an equipment malfunction, Scheana worries about Shay's drinking, and just hours before leaving paradise, Jax winds up in jail.

Accused of shoplifting, Jax must answer to the courts, his girlfriend, and - worst of all - Lisa Vanderpump. Stassi finally tells the whole story of her sex tape crisis, and returns to SUR to repay Lisa for helping her keep the tape from leaking.

When Stassi runs into her old SUR crew at Lala's house party, Scheana must finally answer for her part in Stassi's sex tape scandal. A humiliated Jax brags about his girlfriend's breast enhancement and tries to assert his social dominance, but his friends are not impressed. Tom Sandoval works on a new single, Kristen continues her serial dating, and Tom Schwartz lands in hot water with Katie when he quits his job for Lisa Vanderpump.

Against Lisa's better advice, Katie surprises Stassi in Palm Springs. James convinces himself that Kristen is still the answer to all his problems, even after getting him fired. Scheana worries that she's losing her friends, Tequila Katie rears her ugly head, and Jax, Tom Schwartz and Peter try their hand at babysitting.

Katie begs Lisa Vanderpump to have her engagement party at Villa Rosa, but Lisa balks at having Stassi and Kristen on the guest list. Faced with a looming criminal court date, Jax questions everything in his life, including moving in with girlfriend Brittany. Katie enlists Scheana to help plan her engagement party, Sandoval hopes to launch his music career by shooting a video, and James and Kristen pour gasoline on their old flame.

In the Season Four finale, Lisa Vanderpump hosts the biggest party of the year: Katie and Tom Schwartz's engagement. Guests of dishonor Kristen and Stassi stir up trouble, and trash-talking Lala creates a scene. Jax must atone for his crimes first in a criminal court, then in a much-anticipated reunion with Stassi. Tom Sandoval debuts his new song in a live performance at SUR, Scheana confronts Ariana, and Lala gets close to both Kristen and James.

The reunion part one kicks off with Kristen in the hot seat as she faces the heat from James and Ariana. Mike Shay makes his first reunion appearance as he opens up about his struggle with addiction, which results in a surprising resolution with an unlikely source. Also, Lala discusses the difficulties of being the new girl at SUR, plus Jax, Schwartz and Sandoval delve into their wild trip to Vegas.

James discusses those notorious bite marks from Gay Pride. Katie and Tom Schwartz talk about their long-awaited proposal, but not without getting grilled about their sex life. Brittany joins the reunion for the first time to reveal what it was really like moving across the country to be with Jax, and how her life and chest has changed. Plus, Scheana and Ariana explore their rocky friendship and Stassi returns to right her wrongs.

Stassi clashes with Lisa Vanderpump of the handling of Stassi's sex tape. Ariana furthers her crusade against Kristen's comedy career, while Katie explains the vengeance filled return of Tequila Katie, and Kristen and James rehash their one-night of reconciliation. Later, tensions escalate to a new high when James and Jax's explosive argument comes to near blows.

Best known as one of The Real Housewives of Beverly Hills, Lisa Vanderpump opens the salacious kitchen doors of her exclusive Hollywood restaurant and lounge, SUR. Declaring it the sexiest establishment she's ever owned and the place you take your mistress, Lisa rules over her lively and mischievous staff with a platinum fist. Written by Bravo