Season four kicks off with tensions nearing a breaking point between Audrina and Lo.
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Lauren unexpectedly runs into Spencer at Stephanie's birthday party.
Lauren begins to realize that the chemistry she felt for Doug in high school may no longer be there.
A blowout trip to Vegas breaks down when Audrina snubs Lauren.
Lauren and Audrina fight to save their friendship, but it might be too late.
Heidi's sister Holly reaches out to Lauren.
Lauren leaves for family vacation, and things in Los Angeles go awry.
The truth finally comes out about Stephanie's relationship with Lauren's ex-boyfriend Doug.
Lauren gets a letter of apology from Heidi and realizes there's only one thing keeping them from being friends again.
Audrina reconnects with an old flame Cory and finds herself juggling two guys.
Lauren and Audrina travel to Cabo for Brody's birthday.
Lauren tries to make peace between Brody and Stephanie.
Audrina gets her own place, but everyone fears she is moving for the wrong reason.
Whitney travels to New York expecting to reconnect with Alex, but a new boy named Jay steals her away. Heidi is miserable after being fired, but when Spencer approaches Brent to get her old job back, he makes the situation much worse.
Lauren lets Heidi's sister crash at her place. Justin asks Audrina to go away for a romantic weekend, and Heidi's frustration with Spencer grows after she has to beg for her job back.
A rumour about Lauren and Justin threatens to ruin Lauren and Audrina's friendship for good.
Audrina tries to save her friendship with Lauren after accusing her of hooking up with Justin.
Whitney gets offered a chance at her dream job in her New York, and hopes to see Jay while she’s there. Lauren grows nostalgic when she learns her parents are selling their house in Laguna Beach.
Spencer and Heidi ignore the concerns of their families and runaway to Mexico to elope.
Spencer and Heidi deal with fallout of their elopement when Heidi’s mother comes to town.