Last night (May 12), the reality TV star hit up the Nylon Young Hollywood party at the Roosevelt Hotel in Hollywood and a couple beers later, things between Cavallari and a mystery brunette escalated quickly.
Apparently, Kristin was none too happy to see Brody Jenner flirting with the unknown friend and waltzed up to give her the business.
Cavallari began screaming as a “Hills” producer whispered into his microphone, "This is going to get ugly" just another girl defending the mystery woman stepped in.
Luckily, Jenner stepped in after about 5 minutes of bickering and left with Kristin.
