The father of former Disney beauty Miley Cyrus has admitted that despite her engagement to hunk Liam Hemsworth, he isn't convinced that they will actually make it down the aisle.

During an interview to promote his memoir, 'Hillbilly Heart', Billy Ray Cyrus told Nightline that he is 'playing it by ear' and doesn't know if a wedding will ever take place:

"I don't know (if they will get married). I really don't. I play it by ear and I know whatever is meant to be, that's the way it's going to happen."

"I know as I was writing the book I wanted to keep that particular moment (engagement) as open-ended as possible... They're young. They're kids. The great news is, they're great friends. They're really, really good friends."

Last year, the 'Party In The USA' songstress told Marie Claire magazine that she was planning on a long engagement so fans shouldn't expect a wedding that soon: "Life is too short not to be with the person you want to be with. I don't really care about the wedding or the piece of paper as much as I do the promise we've made to each other. And we want to have a long engagement."

Listen to Cyrus' new song, 'Fall Down', here: