Video shows Kristin dating Justin Bobby, while Spencer and Heidi talk babies.By Jocelyn Vena
Kristin Cavallari in "The Hills" season five teaser trailer
Kristin Cavallari made a lot of promises that she'd be spicing things up when she joined "The Hills."
And judging by a new teaser out for season five of the show, which premieres on September 29, she was telling the truth.
The clip confirms the rumor that Cavallari and Justin