Nick Carter, Bindi Irwin, and Paula Deen are among the 13 celebrities to venture out of their comfort zone and onto the dance floor to compete in Season 21 of "Dancing with the Stars." Joining them are Andy Grammer, Gary Busey, and married couple Alexa and Carlos PenaVega. Carrie Ann Inaba, Julianne Hough, and Bruno Tonioli all return to the judges' table, but Len Goodman does not return as a judge for the first time since the beginning of the series. Both Tom Bergeron and Erin Andrews return as hosts and Derek Hough, Sharna Burgess, and Mark Ballas return as dance professionals. Karina Smirnoff, Anna Trebunskaya, Lindsey Arnold, and Louis van Amstel return to the show as dance professionals after taking hiatuses.