It's no secret that Kourtney Kardashian, 36, and Scott Disick's split was partly due to the 32-year-old's alleged cheating, but could it be that Kourt's not so innocent herself?

According to a new report, the duo's youngest son Reign Disick may have a different father — talk about a MAJOR bombshell.

RELATED: Did Kourtney Kardashian Get a Boob Job Following Her Split From Scott Disick? See the VERY Telling Pic!

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“There’s been buzz in their circle that Kourtney cheated and Reign might not be Scott’s,” a source tells OK! magazine.

And Scott's not taking it well. “He flipped when he heard it, and he’s been off the rails ever since,” the source also reveals.

Do you think Kourtney cheated?