`The Hills' follows the personal and professional lives of several young adults living in Los Angeles. Looking for some stability in her life, Kristin attempts to mend fences with Audrina and Heidi, but a rumour about her hard-partying lifestyle gets in the way. Also adding unrest is her relationship with Brody ... or lack of one, now that he has his eyes on someone he's never been able to snare - Audrina. And no one has changed more than Heidi, who looks for the approval of her mother and friends after undergoing numerous cosmetic surgeries. She also has to decide if her marriage to Spencer, now acting more distant than ever, is worth saving.
Heidi crashes Lauren's surprise birthday party and they cry about their disintegrated friendship. Spencer starts a violent fight when Cameron accuses him of picking up a bartender. (S5, ep1)
Spencer's flirtation leads Heidi home to Colorado, where she reconnects with her high school boyfriend. Lauren gives Stephanie a piece of her mind for inviting Heidi to her party. (S5, ep2)
Heidi catches Spencer at a nightclub with Stacie the bartender and demands they go to couples therapy. Lauren puts her reputation on the line when she gets Stephanie an internship. (S5, ep3)
Audrina tries to get over Justin by setting her sights on Brody. Heidi drags Spencer to couples therapy. Stephanie screws up at People's Revolution, so Lauren threatens to fire her. (S5, ep4)
Audrina hooks 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. (S5, ep5)
Audrina's heartbroken as Brody's girlfriend confronts her about Hawaii, and Brody does nothing to stop it. Heidi sees a text message from Stacie to Spencer and confronts her in a club. (S5, ep6)
Justin confronts Audrina about hooking up with Brody. Stephanie ruins a photo shoot at work, and Lauren will have to answer to Kelly. Heidi warns Stacie to stay out of her life. (S5, ep7)
Spencer tries to save his and Heidi's relationship by asking her dad's permission to marry her. Lauren must fire Stephanie, who's heartbroken, as the guy she likes has a girlfriend. (S5, ep8)
Lauren thinks twice about going to Heidi's wedding after Spencer finally apologises. Brody refuses to risk his relationship with Jayde to save his friendship with Audrina. (S5, ep9)
In Lauren's final episode, she must decide if she'll forgive Spencer and go to the wedding. The drama in the pews beats that at the altar, until a surprise guest shocks everyone! (S5, ep10)
Kristin'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 house shopping. (S5, ep11)
After being stood up by Audrina, Kristin decides to stop fighting her attraction to Justin. Heidi wants to babysit a neighbour's child, but Spencer wants nothing to do with kids. (S5, ep12)
Kristin gets a taste of being in a relationship with Justin when he bails on Brody's party, while Audrina goes on a date. Heidi and Spencer argue about when to start a family. (S5, ep13)
Kristin thinks she's tamed Justin but he doesn't seem to be over Audrina. When Holly loses control at an event, it's up to Heidi to make her sister confront her drinking problem. (S5, ep14)
Justin plays hard to get with Kristin, but his plan backfires. Holly's drinking leads to an intervention. Brody and Jayde get into a fight, and they reconsider their relationship. (S5, ep15)
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. (S5, ep16)
Kristin and Brody consider dating again, but a run-in with Jayde proves it may be easier said than done. Audrina and Justin discuss their future, and Spencer takes drastic measures. (S5, ep17)
Kristin clashes with Jayde when she comes back to reclaim Brody. Heidi hatches a plan to get pregnant, and Audrina copes with the fact that Justin still has feelings for Kristin. (S5, ep18)
A wild weekend in Vegas makes Kristin unsure if she has real feelings for Justin. Spencer comes up with a plan to find out if Heidi has stopped taking her birth control pills. (S5, ep19)
Kristin decides she doesn't want to be with Justin. Brody gets cold feet when Jayde wants to move in with him. Spencer worries that Heidi might be pregnant. Last in the series. (S5, ep20)