Spencer reunites with Stephanie, but the pair quickly realize that the past will not stay in the past; Mischa faces down her longtime bully Perez Hilton; Sparks continue to fly between Justin and Audrina.
Audrina confronts Justin; Brody laments the state of relations with his estranged father, Caitlyn and Spencer; Heidi and Spencer's relationship is put to the test.
The group heads to Vegas to see Brody's DJ performance; Justin finds himself in the middle of a showdown between Audrina and Stephanie; Wildfires tear through Malibu; Kaitlynn fears for Brody's life when he stays inside the evacuation zone.
Brody and Kaitlynn survey the damage to their home after the Malibu fires, Mischa prepares for a high-stakes movie audition, and Heidi tries to revive her pop music career.
Gossip catches fire and rumors fly after a scandalous incident involving Brody and Stephanie. Audrina is shocked when Justin brings a jaw-dropping date to dinner.
Kaitlynn & Brody's "A -List " gala fractures the group when she excludes part of the crew. Audrina surprises everyone by re-igniting a spicy romance with an old flame. Spencer shocks Heidi with a lavish surprise.
Brody and Kaitlynn are at odds on having kids, Brandon is reluctant to define his relationship, and Audrina and Stephanie's beef boils over at Heidi's bachelorette party.
Brandon tries to broker peace between Brody and Stephanie, Kaitlynn resents the rumors about her marriage, and the friends show up to support Audrina's swimwear show.
Spencer confronts Brody about the legitimacy of his marriage status and the truth is revealed. Brandon makes a final decision about his relationship with Ashley. Whitney shares some emotional news to Kaitlynn about her own personal life.
As the gang gathers to celebrate a renewal of Heidi and Spencer's vows, rumors about Brody and Kaitlynn's marriage threaten to tear apart the group. Are they open? Are they even legally wed?
