Inside Kim's Cheating Scandal! Kardashian Snuck Around With Another Man, Bombshell Tell-All Reveals

Is Kim Kardashian a two-timer?

According to journalist Ian Halperin's upcoming tell-all, Kardashian Dynasty, the sneaky reality star dated both her Australian bodyguard, Shengo Deane, and second husband, Kris Humphries, at the very same time in New York City.

According to reports, Kardashian was first spotted sitting courtside at NBA player Humphries' basketball game on October 31, 2010. They made their public debut just a few days later.

However, the mother of two, now 35, hooked up with hunky Deane while filming Kim And Kourtney Take New York in October and November 2010.

The bodyguard romance aired on the spinoff series in February 2011— when Kardashian and Humphries were celebrating his birthday together in a lavish bash.

"Certainly, as her and Shengo's relationship unfolded on air, she was already publicly dating Humphries," Halperin writes in his bombshell book.

She eventually ditched Deane and settled down with Humphries, but as RadarOnline.com readers know, the couple filed for divorce just 72 days after their $10 million dream wedding.

Now the mother of North, 2, and Saint, 3 months, is married to Kanye West— but the marriage doesn't seem to be faring much better than her disastrous second walk down the aisle.

As RadarOnline.com exclusively reported, the couple is even sleeping in separate bedrooms in their $20 million Bel-Air home.