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Heidi heads home to show her family her post-surgery look, and Kristin's all-night partying begins to worry Audrina, Lo and Stephanie.

Stephanie gets blamed for spreading the rumors about Kristin's drug abuse problems, and Spencer lashes out when his sister approaches him at a party....

Kristin urges Audrina to commit to Ryan, then moves in to get closer to Brody and Spencer causes as scene when he gets angry with Holly at Enzo's party....

Heidi and Spencer's behavior cause their friends and family to make a difficult choice, while Kristin and Brody hook up but agree to stay single.

Brody puts his friendship with Kristin on the line when he starts seeing another girl. Lo sets Stephanie up on a double date....

Kristin has a hard time moving on from Brody. Audrina bumps in to Justin and starts to have doubts about her relationship with Ryan.

When Justin Bobby shows up onstage at a show Audrina, Steph and Lo are at, all the girls are surprised.

Audrina's relationship with Ryan is put to the test when he meets Justin for the first time. Brody sides with Kristin when Allie picks a fight with her.

It's Audrina's birthday and the gang, including Justin, board a boat at Marina Del Ray to celebrate. Elsewhere, Kristin has another run in with Allie at a club where a fight erupts. Also Audrina breaks up with Ryan and Kristin warns McKaela to stay away from her.

The gang heads to Costa Rica for a group surf trip, and Brody gets jealous when Kristin hooks up with a local bartender. Meanwhile, Audrina fights her attraction to Justin, and Stephanie finds herself at odds with the jungle environment

Brody and Kristin have a heart-to-heart, she wants to give their relationship another shot and Stephanie starts seeing someone new.

In the final episode of The Hills, there will be goodbyes, tears, promises, love and heartbreak. Kristin will have to decide if she's going to make a major change in her life, which may force Brody to make a decision about their relationship. Audrina chooses a new, independent life without Justin, but will that be the right choice? Lo weighs whether or not to take the next step with her boyfriend, and Stephanie, for the first time, believes that she's found true happiness.