Noticeable vets that are absent from the list? Tony Dovolani, who has been on the show since season two and Kym Johnson. Of course, there are still three pairs .\r<br>\r<br>Past mirror ball champions Derek Hough, Mark Ballas and Karina Smirnoff are among the pros returning for season 21.\r<br>\r<br>DANCING WITH THE STARS - SEASON 21 - BALLROOM DANCING COMPETITION The full cast was revealed on Wednesday September 2, 2015 on GMA.\r<br>\r<br>DWTS Season 21 Pros Revealed - GMA featuring Pros: Derek Hough, Witney Carson, Peta Murgatroyd, Val Chmerkovskiy, Artem Chigvintsev, Mark Ballas, .
