Billy Ray Cyrus joked about Miley's pregnancy rumours. (Getty Images, Instagram)
Los Angeles - Billy Ray Cyrus has joked he is to become a grandad.
The country musician - who is the father of Miley, 22, Braison, 20, Noah, 15, and Christopher Cody, 23, as well as adopted stepchildren Brandi, 27 and Trace, 26 - has laughed off rumours Wrecking Ball hitmaker Miley is pregnant by joking about a new arrival on Twitter.
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