'Hills' Buzz Moment #5: Kristin Cavallari Declares War

In her first episode as the new star of 'The Hills,' Kristin tells Audrina and Stephanie: 'It's on, bi---!'

With so many moments counted down — and with the stars giving MTV News their favorites before "The Hills" final season debuts Tuesday — we've now reached #5 on our list of the most buzzed-about scenes in the show's history. With Lauren Conrad off the show in season five, newcomer Kristin Cavallari immediately brought her own brand of drama.

Since her days on "Laguna Beach," wherever Cavallari goes, the drama follows. When she made her big return to reality TV, she made sure we knew that she was back in full force. As a surprise guest at Speidi's wedding, Kristin immediately hung out with Justin Bobby, much to Audrina Patridge's dismay.

Months later, when the entire crew was hanging out at a rooftop party, the two ladies came to verbal blows over JB. No one could have predicted that during Kristin's first episode, the drama that we've always loved on "The Hills" would be brought to a whole new level.

That fight — in which Kristin declared, "It's on, bi---!" — certainly set the tone for the rest of the season, and Kristin lived up to her promise of bringing nothing but excitement.

"The [moment] that really stands out the most for me was the first episode that I was on. ... The fight that I got into with Audrina and Stephanie was so out of left field," Cavallari later told MTV News. "It was the last thing I was expecting to happen, and it was probably one of the biggest fights I've ever been in."

What are some of your favorite "Hills" moments? Let us know in the comments below!

"The Hills: Final Season" premieres Tuesday at 10 p.m. ET/PT followed by "The City" at 10:30 p.m. ET/PT on MTV.