Heidi Montag at The Hills Season 4 Party

Heidi Montag and Lauren Conrad party it up at The Hills Season 4 premiere party held at Paradise Cove in Malibu on Monday night. “The show is definitely reaching its end,” Lauren told.

Also in the house were Heidi Montag and Spencer Pratt, rocking a khaki one-shoulder minidress with white platform heels and a dark suit respectively.Heidi Montag and Spencer Pratt tell Extra they plan to get married on live TV. "I'm just waiting for that big ring," Montag, 21, said in an interview.