Billy Ray Cyrus on Miley's wedding: 'I don't know'

Hmmm. Sounds like the father-of-the-bride-to-be Billy Ray Cyrus isn't too sure about daughter Miley making it to the altar with Liam Hemsworth.

The two got engaged almost a year ago (May 31) and for months there's been buzz of trouble in the relationship.

"They're young. They're kids," Billy Ray tells ABC News in a Nightline interview to promote his new book, Hillbilly Heart. He adds that they are "great friends."

Will they get married? "I don't know."

When Bob Woodruff asks him what Miley tells him, the singer/dad replied, "I play it by ear and whatever's meant to be, that's what's going to happen."