This is perhaps the most far-fetched Kardashian rumor to date. There's a new report that suggests Scott Disick, who recently broke up with his long-term partner Kourtney Kardashian, might have slept with her younger sister, Kylie Jenner.

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According to Life & Style Magazine's print edition this week (via Gossip Cop), Scott not only cheated on Kourtney with 18-year-old Kylie, but with her sister Khloe, too.

A source close to the Kardashian family says that Scott supposedly broke down when Kourtney recently visited him during his stint in rehab. He allegedly confessed about all the times that the cheated on Kourtney behind her back with her own sisters.

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The source said that Scott allegedly had sex with Kourtney in the shower during their stay in the Hamptons last year and that he had "drunken sex" with Kylie when she was a minor as well.

A family insider says that the rumor is simply untrue and that Scott never confessed about his shenanigans to Kourtney because there weren't any to begin with.

Scott and Kourtney broke up last year after being with each other for several years. The ex-couple supposedly split because of Scott's wild partying and addiction to alcohol. Reports indicate though that Kourtney and Scott are making an effort to co-parent their three children together, Mason, 5, Penelope 3, and 1-year-old Reign.

There has been speculation though that the couple might reunite for a story line on their show, Keeping Up With The Kardashians, although that rumor has been unconfirmed.

Keep up with Enstars for all the latest news on Kourtney Kardashian and Scott Disick along with all of your favorite reality television stars right here.