To celebrate the centennial of Beverly Hills and meet other local business owners, Kyle Richards throws a cocktail party at her home for the city's Chamber of Commerce. She hires Lisa's posh restaurant, SUR, to cater the event but in typical fashion, one of her servers begins talking back and Lisa has to send her home before the guests begin to arrive.

Jax gets a tattoo of Stassi's name to prove his love, but the ink's barely dry before their romantic dinner turns ugly over the new guy in her life.

Stassi and Jax rekindle their romance when the staff heads for her mom's Lake Arrowhead home. Lisa smacks Scheana down for playing the sympathy card.

Stassi learns of Jax's sexy photo shoot and wonders if she can ever trust (or love) him again. A hot new bartender threatens Kristen's life with Tom.

Lisa gets Stassi and Katie to do a sexy dance at Guillermo's burlesque birthday bash. If Jax expects sympathy for a health scare, it won't be from Stassi.

As everyone joins in the Gay Pride Parade, Stassi finds out Jax is back to womanizing and Kristen confronts Tom and Ariana with evidence of a relationship.

Scheana gives Peter a wild lap dance for his 30th birthday and is tossed from the party. Stassi accuses Jax of being a sex addict, then gets a real shock.

With the restaurant staff (especially Stassi!) more focused on rumours than customers, Lisa hires a "secret diner" to evaluate the service at SUR.

When The Real Housewives of Beverly Hills have a dinner party at SUR, Stassi and Jax see how Lisa's high-class friends can be just as vicious as their own.

Team SUR go to Cabo for Stassi's 25th birthday and catfights quickly ensue. When a drink gets thrown in Katie's face, Stassi lashes out at her friends.

Jax crashes the Cabo booze cruise, and Kristen gives Lisa a stunning ultimatum. After a final drink fest, Kristen's shocking decision changes everything.

Lisa and Stassi throw Scheana the perfect surprise engagement, while Tom gets in Jax's face for the cheating rumours, then jolts Stassi with his own news.

As tensions at SUR reach all-time highs, Stassi devises a plan to expose Kristen in front of her friends, for what Stassi considers the ultimate betrayal.

It's a showdown for the ages in the tumultuous season finale when Kristen and Tom finally face off with Stassi and Jax at Scheana's engagement party.

Bravo's Andy Cohen gets everyone together for the first time since the fiery finale: Who's been dumped? Who's sleeping with whom? Who might be leaving for good?

All is exposed in Part 2: Why Kristen slept with Jax, why Jax has no remorse for old friend Tom, and if Stassi can overcome the hurt and betrayal.

This special episode dishes out never-before-seen moments - Witness the season's most revealing, embarrassing and hilarious scenes for the very first time!