Sadie Robertson says her most memorable year was 2012, the year Duck Dynasty began airing on TV. (ABC)Sadie Robertson says her most memorable year was 2012, the year Duck Dynasty began airing on TV. (ABC)Sadie Robertson and Mark Ballas danced the Viennese waltz to "Married Life" from Disney's "Up." (ABC)Sadie and Mark (ABC)"Duck Dynasty" star Sadie Robertson came in second place on Season 19 of "Dancing with the Stars."