Schaena Marie

Lisa's staff heads to Cabo for Stassi's 25th birthday, but a vulgar comment from Scheana turns the celebration into a catfight. When a drunken argument ends with a drink thrown in Katie's face, Stassi lashes out at her friends for taking the spotlight away from her birthday.

Lisa tries to wish Peter a happy 30th birthday, but when Scheana gives Peter an inappropriate lap dance, Katie and Kristen pick a fight and run Scheana out of the party. Stassi accuses Jax of being a sex addict, only to learn that Jax may have slept with one of her best friends.

Lisa and Stassi throw Scheana the perfect surprise engagement. Tom lashes out at Jax for his part in the cheating rumors, but later shocks Stassi with his own news. Kristen's meltdown at SUR causes her friends to retreat and support her archrival, Ariana.

Stassi's Cabo birthday continues to unravel as Jax crashes her booze cruise and brings uninvited guests. Kristen gives Lisa an ultimatum that doesn't sit well with her boss. After a final night of drinking, Kristen's shocking decision forever changes her friendships.

After Katie reveals the rumor that Kristen slept with Jax, Stassi hatches an elaborate plan to trick them into confessing. Lisa hires a "secret diner" to evaluate the service at SUR, but the staff is more focused on rumors than customers.