The former couple, who almost got hitched in Vegas on Keeping Up With the Kardashians, quietly called it quits late last year.
So the exes had tongues wagging Saturday when they met up at 50 Cent and VitaminWater's dinner party at Sundance. "They were holding hands and hanging out," says an eyewitness.
Does this mean a reconciliation in the works?
Not quite. They ended up getting in a huge fight. "Joe [Francis] pulled Kourtney away, and they all left," an onlooker says of the spat.
Up next for Kourtney? She'll most likely spend some family time in Tampa for the Super Bowl next weekend. Kim is cohosting the Leather and Laces party with Jenny McCarthy and Carmen Electra, while Khloé is headlining a bash at the Seminole Hard Rock Hotel with Kevin Dillon.