Jessica claims her ex-boyfriend, Jason, cheated on her during most of their 18-month relationship. She claims she found a naked woman in his shower; and she also says she knows he cheated on her with his Redneck Island partner, Katie, when Jessica was pregnant with Jason’s baby.

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Jason, who went by the nickname “Tank D” on the popular CMT reality show, says Jessica is crazy, paranoid – and has “zero proof” he cheated.

But Katie is telling a different story. In the video above, she confirms Jessica’s suspicions that she and Jason had a sexual affair. “We had an instant connection. We were cooped up in this house – one thing led to another, and we became romantic,” says Katie. She also admits she knew Jessica was pregnant at the time.

Now that Katie has confessed to having a fling with Jason, will he take responsibility and acknowledge he cheated on Jessica?

This episode of Dr. Phil airs Wednesday. Find out where you can watch here.

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Reality TV Star Tank D’s Ex Claims He's 'A Boozing, Partying, Redneck-Womanizer'