VIDEO: Sixth Season Of The Ever-Changing Hills Kicks Off

The Hills are alive, with the sound of catfights: MTV’s hit reality show, minus Audrina Patridge and Lauren Conrad -- but plus Laguna Beach starlet Kristin Cavallari -- returned Tuesday with the premiere episode of its sixth season, which looked to have all the drama, double-crossing and ego clashes viewers have come to know and love from the well to-do California-based cast.

Spencer Pratt's sister, Stephanie (who said her and buddy Lo Bosworth would both be leaving the show after the season) is already clashing with Cavallari and  laid out the welcome wagon for her new castmate: “Kristin is not good news. She’s going to stab us all in the back. Every girlfriend in L.A. needs to worry about her boyfriend. How can one person turn all of our lives upside down?"

The Hills airs on MTV Tuesdays at 10/9c.