Lauren finds herself between two friends when Audrina and Lo struggle to get along. Plus, Heidi's sister pays a surprise visit.
Stephanie's hope for a drama-free birthday party end when Lauren, Spencer and Heidi all show up.
Lauren decides it's time to break things off with Doug and Whitney starts her new position at People's Revolution and meets a male model in NYC.
In Vegas for Frankie's birthday, Brody sends Stephanie into tears and later lands in jail. Plus, the tension between Lauren and Audrina continues to escalate and Heidi's sister, Holly moves to LA.
Lauren and Audrina finally face the awkwardness, and Spencer sends Holly packing.
When Lauren has an unexpected lunch with her old friend (and Heidi's sister) Holly, she's left reminiscing about the good times she had with the Montag girls.
Lauren takes off to Europe for a few days and everything goes awry. Audrina and Justin hang out with Spencer and Heidi, and Stephanie has a date with Doug behind Lauren's back.
Lauren and Stephanie's friendship sours after Lauren discovers that Stephanie went on a date with Doug while Lauren was away.
Spencer's happy to discover that Lauren and Heidi can't be friends until he's out of the picture, because he thinks that could never happen. But, Holly insists there could still be a chance.
Audrina reconnects with an old flame and finds herself juggling two guys. Meanwhile, Spencer pushes Heidi to make a decision about her living situation.
Already over her short-lived relationship with Colin, Audrina dishes to Lauren about her upcoming date with Cory, the Australian who Audrina hasn't seen in a while. Audrina tells Lauren that Justin doesn't know about this date yet, but she wants him to be jealous.
Corey makes his feeling clear when he gives Audrina a toy koala bar asks Audrina to come to Australia with him. But Audrina confesses that her heart still belongs to Justin, and she has to say a sad 'goodbye' to Corey.
When Audrina gets her own place, her friends fear she is doing it for the wrong reason. Heidi invites Spencer to a work event.
Spencer confronts Brent Bolthouse, but only makes matters worse for Heidi. Whitney travels to New York.