DWTS Season 21 - GMA - 1st Camera Blocking featuring the couples: Bindi Irwin and Derek Hough, Chaka Khan and Keo Motsepe, Hayes Grier and Emma .\rbr\rbr\rbr\rbrAmerican serviceman Alek Skarlatos, who helped stop a gunman on a French train last month, performed on the season premiere. SUBSCRIBE to ABC NEWS: .\rbr\rbr\rbr\rbrGet the hottest scoop on your favorite stars, TV shows, movies, and more! - Like us and join in . Bindi Irwin Joins Dancing with the Stars as the First 2015 .