The Hills - Season 6, Episode 9: Soundtracks

Audrina tells Kristin that she ended things with Ryan; Kristin tells her she invited Justin to the party.

Brody and friends meet up with Kristin and the girls for a night of partying.

Kristin, Stephanie and Lo shop for Audrina's birthday, and discuss whether they should invite Justin

Brody tells Frankie and Taylor about his troubles with McKaela since she started bringing Allie around.

Kristin and Brody dance and flirt at the club.

After a confrontation with Allie, Kristin leaves the club infuriated, causing McKaela even more tension.

Kristin goes to Smashbox to meet up with Lo, but when McKaela tries to apologize for the tension with Allie, the two don't see eye to eye.

Audrina goes to Ryan's to talk about what happened at his concert.

Audrina breaks up with Ryan; Kristin meets up with Justin to tell him Audrina and Ryan are having troubles.

Kristin invites Justin to Audrina's birthday party, and encourages him to reach out to her now that Ryan's out of the picture.

Audrina's friends gather in Marina Del Rey to celebrate her birthday with a chartered boat ride

Audrina's birthday party gets underway as the boat sets sail with Justin at the helm.

Brody invites the group to join him on his upcoming trip to Costa Rica, and they toast to friendship.

Justin and Audrina talk about the lessons they've learned from dating and life.