Miley Cyrus' Mom Tish, Brett Michaels Deny Affair 1Miley Cyrus’ mom Tish Cyrus is at the center of tabloid reports that an affair wiht Poison singer Bret Michaels broke up her marriage to Billy Ray Cyrus, but she is heatedly denying the rumors.

When Billy Ray learned about the fling, he filed for divorce Oct. 27, sources tell Us Weekly.

Michaels, 47, reportedly “became close to the entire family” this past February when he and Miley released the racy duet “Nothing to Lose,” an insider says.

Soon after, he and Tish, 43, began a down-low romance.

“Billy Ray was completely unaware of what was going on,” the source says.

But Tish is heatedly denying the report and hoping to put her marriage back together.

A rep for the Poison singer has also denied the allegation, saying “there has never been an affair or a fling.”

At the time Billy Ray filed for divorce in Tennessee, the family released a statement through their lawyers.

“We are trying to work through some personal matters. We appreciate your thoughts and prayers,” it said.

Other tabloids have been trying to blame Miley for her the divorce because of her increasingly risqué persona.

But Miley, who will turn 18 this month, has never not had the support of her parents, at least publicly.