While he's best known as Robby Ray Stewart, Miley's Dad on 'Hannah Montana,' Billy Ray Cyrus has been acting since 1999, when he made an appearance on 'The Love Boat: The Next Wave.' Perhaps his best role was as Dr. Clint Cassidy on 'Doc,' a hit for the PAX network until 2004. Cyrus has also had parts in numerous films, including the award winning David Lynch movie 'Mulholland Drive' from 2002.