scottkristen460crop111611.jpg

Scott Disick and reality starlet Kristin Cavallari hooked up while he was on a break from Kourtney Kardashian, according to Life & Style.

Mason's daddy has been attending tapings of Dancing With The Stars to support Rob Kardashian, but a source tells the mag that Kourtney has now "banned" her boyfriend from showing up at DWTS due to arguments about Cavallari.

A source tells L&S:

    “Scott and Kristin hooked up in Las Vegas during a time [February 2009] that he was on a break from Kourtney.”


The alleged affair took place just before Kourt got pregnant with their son Mason.

Another source adds, “Actually, Scott and Kristin were hooking up on and off for a year, maybe even two. When Kourt and Scott would fight, he’d party with Kristin and hook up.”

The Kardashian sisters now reportedly refer to Cavallari as "the whore bag." Ouch!