Online Dish: Did Miley Cyrus' Mom Cheat with Bret Michaels?

Bret MichaelsMiley CyrusKIAH

Forget Rock of Love, Rock of Cheat is more like it. Word has it the reason Miley Cyrus' parents are splitting up after 17 years of marriage is because her mom, Tish, has been having an affair with rocker Bret Michaels.

When Billy Ray discovered the affair along with at least another fling, he filed for divorce on Oct. 27th.

Sources tell Us Weekly, Michaels, 47, became close to the entire family" this past February when he and Miley released the racy duet "Nothing to Lose".

He and Tish, 43, soon began carrying on an affair.

Tish was even seen at Michaels' Feb. 28 show at the Key Club in L.A., and he had once asked her production company's help to adapt his book, Roses & Thorns, into a movie.

"Billy Ray was completely unaware of what was going on," the source says of the "Achy Breaky Heart" one hit wonder, who is seeking joint custody of their three minor children, Miley (who turns 18 Nov. 23), Braison, 16, and Noah, 10. (They have three older children from previous relationships.)

A rep for both Tish and Bret denies the allegations.

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