Cameras pick back up after Ariana discovers that her boyfriend of nine years is having an affair with one of her best friends; Schwartz panics when the scandal threatens to upend their business; Sandoval comes clean with another shocking secret.

When Stassi believes that Kristen committed the ultimate betrayal, she devises a plan to expose her in front of all of her friends. Lisa struggles to keep SUR’s working dynamics under control when tensions between Jax, Tom, Stassi and Kristen reach all-time highs.

Andy Cohen sits down for intimate one-on-one interviews with Ariana, Tom and Raquel to get to the bottom of the cheating scandal; James nearly comes to blows with Sandoval over the affair; Katie and Schwartz rehash the implosion of their divorce.

In the season finale, SUR's sexy annual photo shoot turns tearful as Stassi attacks Jax for his womanizing, and Lisa helps Tom deal with the growing evidence of Kristen’s infidelity. Things come to an explosive head at Scheana’s engagement party when Kristen and Tom finally face off with Stassi and Jax.

Ariana and Katie host a preview party for their sandwich shop; James takes an exciting step forward in his career; Tom and Ariana have a serious talk about the state of their relationship; Raquel confronts Katie for rage-texting Schwartz.

Lisa throws two huge parties for Gay Pride; James flaunts fresh love bites, and everyone wants to know who was responsible; Tom Sandoval and Tom Schwartz kick-start Shay's makeover; Jax seizes an opportunity to move in on Lala.

Lisa officiates the ceremony that only Katie and Tom could pull off. Jax re-evaluates his relationship, and Ariana considers taking her relationship to the next step. Lisa offers the Toms the business opportunity of a lifetime, but Schwartz fears making two commitments in one day. Scheana reveals a secret about her marriage that will change her life.

Lisa and the SUR staff open up about their issues with Stassi; Tom Sandoval and Ariana confront Kristen over Miami Girl; Tom Schwartz responds to Katie's marriage ultimatum; Stassi reveals the real reason she is no longer friends with Scheana.

While Jax struggles to remain loyal, Stassi tells Kristen how to make Jax reveal Tom's alleged cheating; James apologizes to Kristen to salvage their relationship; Lisa teams up with singer Lance Bass to host a puppy adoption event at PUMP.

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.

When Stassi runs into her old SUR crew at Lala's party, Scheana must finally answer for her part in Stassi's sex tape scandal. Jax brags about his girlfriend's breast enhancement, 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.

The gang heads to Hawaii to celebrate Jax and Tom's birthdays; Tom learns Scheana sent derogatory text messages about him to Ariana's mother; Katie lashes out when Lala swims naked in front of Schwartz.

Lisa Vanderpump hosts Katie and Tom's engagement party; Stassi and Kristen stir up trouble; Jax must atone for his sins during a reunion with Stassi; Tom Sandoval performs his new song at SUR; Lala gets close to Kristen and James.

Katie and Schwartz take a trip to scout their wedding venue, but when Schwartz shows signs of cold feet, Katie hits him below the belt. Meanwhile, Tom takes Ariana on a romantic date but discovers that he wants marriage and kids more than she does. Later, Scheana learns a scandalous rumor about Lala, while Lala learns two scandalous rumors about James. Finally, Lisa advises Katie to mend her relationship before the wedding.

Vicious behavior abounds when the ladies from "The Real Housewives of Beverly Hills" arrive for a dinner party at SUR. Meanwhile, Kristen's preoccupation with rumors about Tom leads to a five-woman shouting showdown.

When Stassi refuses to forgive Katie for attending Scheana’s bachelorette party, Katie must either fight for her friendship or cut Stassi out of her life. Peter mistakes Vail’s flirting for interest and asks her on a date that quickly turns awkward. Kristen connects with the girl Tom Sandoval allegedly cheated with in hopes of finally breaking up his relationship with Ariana.

Lisa confronts Kristen about her disrespect for management and arrives at a final decision in regards to her future at SUR; Tom Schwartz makes a shocking revelation to Katie; Scheana debates whether to rescind Kristen's wedding invitation.

Lisa advises the women to get back at their boyfriends for going to Las Vegas, so Lala, Katie and Ariana kiss and make up at Scheana's sleepover; Jax, Schwartz and Sandoval strive to remain loyal to their girlfriends while in Sin City.

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.

Lisa Vanderpump holds Stassi at arm's length; Scheana and Ariana realize their friendship is damaged; James schemes to get an invitation to Hawaii with the others; Katie shows off her engagement ring at SUR; Faith and Lala go skinny-dipping.

When Stassi visits Kristen, she reveals the truth about her sex tape; Arian refuses to accept Scheana's apologies; Lala kicks James out of bed; Jax winds up in jail.

Scheana questions going on a birthday trip with Stassi and Katie following a vicious fight with them. Also, Lala begins to dread Ariana's Sonoma birthday getaway upon discovering she'll be stuck with Jax, and James pleads to get his DJ job back.

Sandoval decides to celebrate his birthday with a "Fund-Rager" to raise money for a good cause; Scheana accuses James of cheating; Kristen hosts a roast for Jax; Katie decides to get a medical marijuana card.

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.

A gator tour with Ariana and the groomsmen has some bite when talk turns to Schwartz's relationship troubles. Also: Kristen hires a female stripper while the men dress in drag; and Katie's anger toward Schwartz is addressed, leading to an all-out fight.