Billy Ray Cyrus' Wife Tish Cyrus Files for Divorce

Billy Ray Cyrus is getting divorced ... TMZ has learned.

Billy Ray's wife, Tish Cyrus, is citing "irreconcilable differences" in her filing. Her decision to pull the plug on the marriage comes 3 years after Billy Ray filed for divorce but dropped it in an attempt to work things out.

Billy Ray and Tish have been married for 19 years and have 5 children, including, of course, Miley. There's only one minor child left, Noah Cyrus, who is 13. Tish is asking for full physical and legal custody, with visitation to Billy Ray.

Tish is also asking for spousal support, and she wants him to pay her attorney's fees. The date of separation is listed as TBD.

Tish tells TMZ, "This is a personal matter and we are working to find a resolution that is in the best interest of our family. We ask that you respect our privacy at this time."

A few hours ago, Miley tweeted @billyraycyrus, "since your texts and email obviously aren't working would you like to talk like this?"

Interesting ... when Billy Ray filed the first time he had said Miley's fame compromised their family.