Who knew Miley Cyrus' "Nothing to Lose" duet would be the least controversial Bret Michaels-related story her family would have to address?

According to Us Weekly, Billy Ray Cyrus' impending divorce from Tish Cyrus may have had something to do with a third party. Sources claim Tish, 43, actually had an affair with the 47-year-old rocker.

Michaels reportedly "became close to the entire family" when he started working with the teen star earlier this year. At one point, he asked Tish and her production company for help in bringing Roses & Thorns, his book, to the big screen.

"It was a professional relationship that turned into something more," an insider claimed. "Billy Ray was completely unaware of what was going on."

Reps for both Bret and Tish deny the accusations.