Sadie Robertson has joined the cast of Dancing With the Stars … and guess who her partner is … Mark Ballas. Duck Dynasty star Sadie Robertson has dreamed of being on the show for many years and she’s young (17 years old), which makes learning the routines a lot easier. Robertson is the daughter of Willie Robertson, and granddaughter of reality star Phil Robertson, who’s made plenty of headlines over his homophobic rants. Despite that negative publicity, Duck Dynasty is a huge franchise with an extremely large fan base, which should definitely work in Robertson’s favor. Could these two take the Mirrorball trophy this season?