Billy Ray Cyrus unsure if Miley Cyrus and Liam Hemsworth will marry

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While promoting his new memoir, "Hillbilly Heart," country singer BIlly Ray Cyrus spoke to Nightline about the relationship between his daughter Miley Cyrus, and her fiance Liam Hemsworth. The couple is rumored to have put their impending marriage on hold as they try to work through issues.

Billy says he wanted to keep the possibility of his daughter's marriage to Hemsworth as open-ended as possible in the book. "They're young, they're kids," he explains, "The great news is they're great friends. And if you end up getting married, that's your business."

When asked point blank if he thinks they will follow through with the wedding, Cyrus answers, "I don't know." He says, "I play it by ear, and I know whatever is meant to be, that's the way it's going to happen."

In the meantime, Liam is back in the United States and Miley seems to be having a blast out on her own.

Check out the interview clip below:

Photo/Video credit: Getty Images/ABC