Lauren doesn't go to Heidi and Spencer's housewarming party.
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Lauren and Heidi grow even farther apart when Spencer asks Heidi to marry him.
Lauren tries to help Audrina decide if Justin is boyfriend material.
Heidi takes her fiancÚ Spencer to meet her family in Colorado.
Heidi's social circle shrinks as Spencer "breaks up" with Brody for hanging out with Lauren.
Lauren gets a blast from the past when her ex-boyfriend Jason calls.
Lauren's feelings for Jason are rekindled, but when they run into Heidi and Spencer, tempers flare.
Lauren is shocked to learn that Jason has a girlfriend, but Jason has a bigger surprise for her.
The gang celebrates Brody's birthday in Vegas and Audrina's boyfriend causes a rift in her friendship with Lauren.
Jen Bunney tells Lauren that Brody started the rumors about her, but Brody blames on Spencer.
Lauren starts a new romance with a male model, but realizes she still has feelings for Brody.
Lauren and Whitney are sent to New York City to present for Teen Vogue's top editors.
Lauren and Whitney struggle to put on a fashion show at Teen Vogue's Young Hollywood Party.
Heidi and Lauren have another fight in public causing Heidi to apologize for everything.
Lauren plays matchmaker for Whitney; Spencer resists Heidi's plans for a fairytale wedding.
Audrina catches Justin kissing another girl; Spencer's sister picks a fight with Lauren and Brody.
Lauren thinks Brody might be too much of a playboy for her ever to get serious about him.
Lauren struggles to figure out her relationship with Brody, but an offer to work in Paris makes things more complicated.
Lauren finally gets to go to Paris, and Spencer chases Heidi to Colorado to try to win her back.
Whitney must choose between Teen Vogue and a new career, and Lauren clashes with Brody.
Lauren makes an unlikely friend when Spencer's sister Stephanie joins her fashion class.
Lauren invites Stephanie to her b-day party; Heidi and Spencer question Stephanie's loyalty.
Heidi tries to win back Audrina's friendship, but Lauren grows suspicious of Heidi's motives.
Heidi loves her single life, until seeing Spencer with other girls makes her jealous.
With Spencer out of the picture, Heidi makes a last attempt to regain Lauren's friendship.
An old romance is rekindled when Stephen Colletti reenters Lauren's life.
Lauren is caught between friends, as tension between Lo and Audrina builds.
In the season finale, Audrina feels shut out by Lauren's close friendship with Lo, and wants to move out. Lauren makes a heartfelt attempt to patch things up with Audrina, but it may be too late.