Kim Kardashian is reeling and now sister Kourtney Kardashian is roiling after reports her boyfriend and baby daddy Scott Disick began a torrid sex affair with Kristin Cavallari in 2009.

Cavallari, a reality star as well, has denied the affair and claims it’s just another Kardashian publicity stunt to take the media focus off Kim Kardashian, who has been battling allegations her marriage was a sham so she could stage a lucrative wedding extravaganza.

“I just think, what convenient timing for them with their show premiering next week and with everything that’s going on for Kim, I feel like they’re trying to take the heat off her,” Cavallari said.

Ironically, Cavallari turned up as a contestant on ABC’s “Dancing with the Stars,” at the same time as Kourtney’s brother Rob Kardashian, who was hoping to jump star a career, any career, from the show.

Not suprisingly, Disick has been noticeably absent from the Kardashian DTWS cheering section, although Khloe Kardashian hasn’t hesitated to drag her husband Lamar Odom on the show.

Kourtney reportedly banned Scott from attending DWTS because of Cavallari.

Now, tabloid gossip magazine Life&Style, which has covered the Kardashian’s extensively, reports that the affair took place before Kourtney became pregnant.

Disick reportedly hooked up with Cavallari during a jaunt to Las Vegas, an unnamed source told the magazine.

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

The affair was more than a one time fling, and went on “for quite some time,” according to a second source.

“Actually, Scott and Kristin were hooking up on and off for a year, maybe even two,” the second source claimed.

“When Kourt and Scott would fight, he’d party with Kristin and hook up.”

Kristin once dated Kourtney’s step-brother Brody Jenner, and the two were close friends until Kourtney found out that Scott was seeing Kristin in Los Angeles.

“Kourtney was furious,” the friend said. “She and her sisters have called Kristin ‘the whore bag’ ever since.”

Kim, meanwhile, is still reeling from the collapse of her marriage to NBA basketball star Kris Humphries.

She’s endured a unrelenting wave of negative publicity and both sides have lawyered up. The divorce is proceeding.

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