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Life & Style reports in their new issue that Scott Disick, the baby daddy and Stage 5 Clinger of the Kardashian family had an affair with Hills star Kristin Cavallari shortly before impregnating Kourtney. Kristin says this is "100 percent not true," and accused the Kardashians for fanning the flames.

She told Access Hollywood yesterday the following: "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… When there's a big story like that, they always call you and ask if you want to comment and clearly none of them denied it, so it's very, it's really disrespectful to me and I'm in a committed relationship. It's disrespectful to me and Jay [Cutler] and I think it just says a lot about their character."

Oh, snap. Is she about to go West Side Story on the Kardashians? Should we expect some sort of knife fight on Sunset Boulevard? No one puts Baby in the corner, ya hear that Kris Jenner?

Do I think Kristin and that creep Scott have hooked up? Um, is the sky blue? Those two kids are always in Vegas. They are what my mom would have referred to as "fast kids." They have probably made out on several of occasions, but don't remember. Do I think he was making out with her while on a break with the cub Kardashian? Maybe not. Regardless I do think the Kardashians are using this an opportunity to push press away from the destruction of Kim's nuptials. There is some sort of petition making the rounds for an end to their show.

You know what is sad? Not that Scott may have carried on a torrid affair with Kristin from The Hills, but the fact that people get worked up enough to sign a petition against the Kardashians and not about something like world hunger.

Messed up, right?

-Kate Casey

Kate Casey is a Pop Culture Lover. PR Pro. New mom. Comedy nerd. Celebrity gossip fan. Follow her on Twitter

Denial, it's more than a river, it's what Kristin Cavallari is coming out and saying -- that she did NOT have an affair with Scott Disick, and that the Life and Style report is NOT true.

As posted on Us-

"It's 100 percent not true," Cavallari said on The Billy Bush Show Wednesday.

Cavallari said she was also upset that Disick, 28, and the Kardashian family didn't deny the tabloid story outright.

"I just think, what convenient timing for them with their show premiering next week. With everything that's going on for Kim, I feel like they're trying to take the heat off her," she said. "When there's a big story like that, they always call you and ask if you want to comment and clearly none of them denied it."

"It's disrespectful to me and Jay," Cavallari added, "and I think it just says a lot about their character."

We have to give Kristin credit for that last comment. At least she broke off her engagement before she and Jay Cutler walked down the aisle. Then again, she also wasn't getting paid $18 million to follow through with the wedding. Ah Hollywood!

[Us]

We're not sure to believe all this, mainly because we're not sure that Scott Disick could land another girl, let alone another celebrity.

Life and Style magazine is reporting that Scott Disick (baby daddy of Kourtney Kardashian's kid, Mason) fooled around with the Hills hottie Kristin Cavallari.

If you will recall Rob Kardashian competed against Kristin on Dancing With the Stars this season and Kourtney wouldn't let her boyfriend Scott attend.

via Life and Style-

"While Kourtney and Scott were on a break, Scott hooked up with Kristin," a friend reveals to Life & Style.

So when both Rob and Kristin were confirmed as contestants on DWTS, "Scott and Kourtney argued about Kristin," a friend confirms. "Kourtney can't stand her now and didn't want Scott at show tapings."

A Kardashian pal confirms that "Scott and Kristin hooked up in Las Vegas during a time [February 2009] that he was on a break from Kourtney." The Kardashian pal adds that Kristin, Kourtney and Scott were best friends with Kristin during her Laguna Beach days and even after Kristin stopped dating Kourtney's stepbrother Brody Jenner. Hanging out at Brother Jimmy's in NYC or dancing at the Fontainebleau Hotel in Miami, the three reality stars were close until Kourtney first caught Scott and Kristin on a date at Apple Lounge in LA on March 11, 2009.

Could Kourtney make Scott's life hell now that this is out? Afterall, it's not Kristin with the reality show that's also paying Scott lots of dough.

Some guys just never learn.

[Life and Style]