Stassi and Ariana throw an epic winter-themed birthday party; Stassi's new boyfriend gets his first taste of Stassi's bad birthday behavior; Jax confronts Tom Sandoval for questioning his engagement; James finds himself cut off from everyone at SUR.

Sandoval and Schwartz scramble to get TomTom ready for its opening event; Kristen learns she's not allowed to come; James erupts when Raquel considers attending Girls' Night In; Jax celebrates his first birthday without the support of his parents.

Brittany's fairy-tale theme party takes a turn when her father expresses doubts about his future son-in-law. Ariana confronts Lisa Vanderpump about not respecting Tom and Tom as business partners. Finally, the simmering tensions between Scheana and Adam boil over after Scheana reveals she's been with another guy.

The group treks to Marina del Rey for Scheana's housewarming; Lala calls out Billie Lee; Tom gossips about Ariana's romantic encounters with women; Lisa Vanderpump finally reveals the fully finished TomTom to a giddy Sandoval and Schwartz.

As the Mexico trip continues, Stassi unleashes her insecurities on Beau. Ariana attempts to show Lala the error of her mean girl ways. Lisa oversees TomTom's first dinner service, and Jax dredges up old accusations against Kristen.

Kristen's bizarre behavior threatens to spoil the women's trip to wine country; Scheana breaks down; James is overjoyed when he gets a last-minute invitataion to the guys' "staycation;" Tom Sandoval invites women back to the hotel room.

On the day of TomTom's official opening party, Sandoval surprises Schwartz with a grand gesture; Lisa confronts Lala about her behavior at brunch; Katie sees the group's vacation to Mexico as a chance to reconnect with her busy husband.

Lisa Vanderpump finds herself behind schedule on TomTom, the new bar she’s opening with Tom Sandoval and Tom Schwartz. James lands in hot water with the group after insulting Brittany. Scheana settles into single life. Jax proposes to Brittany.

Katie convinces Lisa to let her host a "Girls' Night In" party, but Billie Lee lashes out at Katie for not including her in the planning; Brittany throws a tantrum; Lala decides James is moving too fast; Stassi creates her own personal holiday.

Scheana goes out with a model in an attempt to make Adam jealous; James accuses Lala of being insincere; Brittany's big Kentucky family descends on West Hollywood in preparation for the engagement party; Jax puts his foot in his mouth.

Stassi plans a surprise party to celebrate Jax and Brittany's engagement; James tries to work his way back into the group's good graces; Stassi seeks Lisa's approval for her new beau, Beau.

Stassi struggles to make amends with Beau after her meltdown; James tries to rekindle his friendship with Lala; Jax causes trouble at a SUR staff meeting; the Toms present their cocktails to Lisa; Katie, Kristen and Stassi's mothers come to town.

The Toms plan a Puerto Vallarta vacation for their friends, but Katie explodes on Sandoval when she learns they've also invited James Kennedy; Kristen and Carter share an awkward dinner on their anniversary; Lisa Vanderpump doles out wisdom.

In Mexico, Lala's decision to return to drinking leads to a panic attack, and Tom Schwartz finds a unique way to rekindle the romance with Katie. Elsewhere, Stassi and Beau try to repair their relationship, and Lisa ponders firing a staff member.

Still grieving over her father, Lala breaks down and lashes out at James, Raquel and Billie Lee; Lisa, Sandoval and Schwartz throw all their effort into preparing TomTom for the grand opening; Jax complains about his upcoming engagement party.

Schwartz takes James to task for insulting Katie, and Scheana feels threatened by Stassi and Ariana's newfound friendship. When Katie is the victim of body-shaming comments, she gives Lisa Vanderpump an ultimatum that will send reverberations throughout the SUR community.

Stassi desperately wants to make a good impression when she first meets Beau's mom, but her hopes are dashed; Sandoval and Ariana finally have an honest discussion about having kids; Jax dotes on Brittany after her dental surgery.

Host Andy Cohen sits down with the SUR gang to discuss Brittany's engagement, the rap that ended James' friendship with Jax and the trials and tribulations of Tom and Tom's first year in business; Jax and James go head to head over allegations.

Katie's ultimatum forces Lisa Vanderpump to reconsider employing James at SUR; Tom Schwartz and Tom Sandoval display different methods of interviewing staff members for TomTom; Jax and Brittany host a dinner party to debut their beer cheese.

Stassi gives Kristen tough love about her relationship with Carter; Sandoval and Schwartz worry that Lisa may not put their cocktails on the menu; Lisa gives James permission to DJ an event at PUMP; Lala is betrayed by her boyfriend of three years.

Lala takes her friends to Solvang, Calif., on a private jet; Jax looks forward to a guys' night out with Tom Sandoval and Tom Schwartz; Brittany brings Jax to therapy to deal with his infidelities; James has a fight with his mother over money.

Tom Schwartz finds a way to make good on his financial obligation to Lisa; Stassi visits a witch to exorcise the demons threatening her relationship; Lala stages a musical performance; Jax reveals some troubling issues during couple's therapy.

Lala and James argue over the demise of their friendship; Katie defends her ultimatum to Lisa Vanderpump; Ariana and Lala reveal the steamy details of their backseat hookup; Billie Lee dishes on her secret hook-up with another cast member.

Stassi and Katie argue with Kristen over her tumultuous relationship with Carter; Jax answers for his bad behavior toward Brittany's family; Stassi's boyfriend, Beau, opens up about their dramatic fights in Mexico; Tom Schwartz defends his manhood.