When Heidi crashes Laurens surprise birthday party, the two old friends cry about their disintegrated friendship. Spencer starts a violent fistfight when Cameron accuses him of picking up a bartender.
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Spencer's flirtatious ways lead Heidi home to Colorado, where she reconnects with an old boyfriend. Lauren gives Stephanie a piece of her mind for inviting Heidi to her birthday party. Spencer ends a long silence with Brody.
After Heidi catches Spencer at a nightclub with Stacie the bartender, she demand's they go to couple's therapy. Lauren puts her reputation on the line when she gets Stephanie an internship at People's Revolution.
Audrina tries to get over Justin by setting her sights on Brody. Heidi drags Spencer kicking and screaming to couples therapy. When Stephanie screws up at People's Revolution, Lauren threatens to fire her.
Audrina tries to get over Justin by hooking up with Brody when the girls crash the boys surf trip to Hawaii. Heidi's virgin ex-boyfriend comes to visit and she hopes some of his values will rub off on Spencer.
Audrina is heartbroken when Brody's girlfriend confronts her about Hawaii, and Brody does nothing to stop it. Heidi intercepts a text message from Stacie to Spencer and goes to a nightclub to confront her.
Lo tells Lauren and Audrina how excited she is about her new job at Smashbox Studios with founder Davis Factor. When Lauren asks Audrina for an update on her status with her ex-bf, Justin, Audrina reveals that he found out about her sleepover with Brody in Hawaii.
At Heidi and Spencer's apartment, Heidi informs Spencer that her "real cowboy, manly-man" dad Bill is coming to town. Heidi tells Spencer that her dad has never met any of her previous boyfriends and that he was freaked out about them eloping to Mexico.
Lauren thinks twice about going to Heidi's wedding after Spencer finally apologizes. Brody refuses to risk his relationship with Jayde to save his friendship with Audrina, and Stephanie confronts Kelly Cutrone.
In Lauren's final episode, she must decide whether she's willing to forgive Spencer in order to be there for Heidi on the day of her "princess" wedding. The entire cast shows up and is shocked by a guest no one saw coming.
Kristin Cavallari's attempt to reconnect with her Hollywood friends goes awry when she angers Audrina by hitting on Justin. Heidi and Spencer embark on married life by shopping for a new house.
While eating lunch at Coupa Café, Kristin tells Stacie that she wants to meet with Audrina to discuss the Justin Bobby love triangle. Kristin admits that she is interested in Justin, and if Audrina wants to sit down like adults to talk about the situation they can figure things out.
Kristin gets her first taste of being in a relationship with Justin when he doesn't show at Brody's surprise party. Heidi and Spencer disagree about when to start a family, and Audrina goes on a date with Justin's best friend.
Kristin thinks she has tamed Justin Bobby, but Justin may not be over Audrina just yet. When Holly loses control at an event, it's up to Heidi to make her sister confront her drinking problem.
Justin plays hard to get with Kristin, but his plan backfires. Holly's drinking leads to an intervention by Heidi and Stephanie. Brody and Jayde get in a fight that leads them to reconsider their relationship.
Justin finds himself in hot water after Kristin and Audrina finally meet face-to-face. All Heidi wants for her birthday is a baby, but Spencer has something else in mind.
Kristin and Brody consider dating again. Audrina and Justin meet to discuss their future, but it doesn't end the way she hoped. Spencer takes the most drastic measure yet in his ongoing war with Heidi over starting a family.
While on a lunch date, Kristin and Brody recall the crazy times they used to have together. After Brody toasts to having a nice lunch without fighting, Kristin mentions that Jayde wants to talk with her. Brody tells Kristin she's out of her mind for thinking about meeting with Jayde considering their fiery run-in at Playhouse.
As Kristin and Stacie road trip toward Vegas, the ladies give squeals of excitement as they drive into view of The Strip. Though Kristin tells Stacie she feels a good weekend is in store for them, she doubts she'll hook up with anyone because of the Brody and Justin drama back home. Stacie encourages Kristin to use their trip to dump her L.A. baggage.
Kristin is in Malibu packing up her beach house when she tells Stacie she doesn't want to pursue a relationship with Justin Bobby. Kristin says things were perfect when they were in Vegas, but she knows real life isn't like vacation. As Kristin explains that she doesn't want to get hurt, Stacie is team JB, warning Kristin that if she doesn't take a risk on a relationship, she's going to end up alone.