Report: Miley's Mom Tish Had Affair With Bret Michaels

OMG alert—there’s a rumor going around that Miley Cyrus’ mom Tish had an affair with Bret Michaels, which is why she and Billy Ray Cyrus are getting a divorce.

Sources tell Us Magazine Billy found out about it last week, and immediately filed for divorce on October 27.

Miley Cyrus' Parents File for Divorce

The source says Michaels "became close to the entire family" this past February when he and Miley released their duet "Nothing to Lose."

Apparently Tish and Bret began their secret affair not long after. "Billy Ray was completely unaware of what was going on," the source explains.

Looking Back at Billy Ray and Tish Cyrus

Michaels’ rep denies the claims, saying "There has never been an affair or a fling. But the source insists, "It was a professional relationship that turned into something more."

Tish was 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.

Star was first to report the allegations. More details to follow…