Heidi's homecoming is ruined when her mother disapproves of her plastic surgery. Kristin and the girls head to Miami for Super Bowl weekend, but the trip goes sour when her hard partying starts to worry Audrina, Lo and Stephanie.
When rumors start spreading about Kristin's partying, the blame falls on Stephanie. Audrina starts dating a new guy, but doesn't stop Brody from pursuing her. Spencer gets upset when he runs into Stephanie at Kristin's party.
On a group surf trip to Costa Rica, Kristin makes Brody jealous by hooking up with a local bartender, Audrina fights her attraction to Justin, and Stephanie finds herself at odds with the jungle environment.
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.