Billy Ray Cyrus has traded his cowboy hat for a fedora to make his Broadway debut as Billy Flynn in the long-running musical Chicago. It's a big step for the man who brought us "Achy Breaky Heart," and, of course, his daughter Miley Cyrus. The "Party in the U.S.A." singer was on-hand to support her dear old dad on November 18, when she, along with mom Tish, sisters Brandi and Noah and brother Braison, took their seats at the Ambassador Theatre to see Cyrus jazz it up as the scheming lawyer. The Cyrus clan hung out backstage and posed for photos with the Amy Spanger and the rest of the Chicago company, who are still in high spirits after celebrating the musical's 16th anniversary on Broadway on November 14. Click through to see photos of one of the hardest working families in showbiz, and don't forget to go see Billy Ray Cyrus in Chicago before his limited run ends on December 23!