In addition to Deen and Skarlatos, Wednesday's GMA announcements included entertainer Tamar Braxton and Kim Zolciak of the Real Housewives of Atlanta. Viewers also learned which professional dancers would be working with which celebrity. Here's the full list of stars followed by their partners:
Tamar Braxton - Val Chmerkovskiy
Nick Carter - Sharna Burgess
Chaka Khan - Keo Motsepe
Hayes Grier - Emma Slater
Alexa PenaVega - Mark Ballas
Carlos PenaVega - Witney Carson
Andy Grammer - Allison Holker
Kim Zolciak - Tony Dovolani
Gary Busey - Anna Trebunskaya
Victor Espinoza - Karina Smirnoff
Paula Deen - Louis Van Amstel
Alek Skarlatos- Lindsay Arnold
Bindi Irwin - Derek Hough
DWTS had been making cast announcements through the past week. Previously announced contestants joined the fun Wednesday morning, including married celebrity couple Alexa and Carlos PenaVega, long-time R&B artist Chaka Khan, wildlife conservationist Bindi Irwin, Backstreet Boys member Nick Carter, jockey Victor Espinoza, Vine star Hayes Grier, "Honey I'm Good" singer Andy Grammer and Gary Busey.
In true Busey fashion, the actor officially joined the show by doing something unexpected: riding onto the set of Jimmy Kimmel Live on a horse.
As for the professional dancers that will join the show this season, fans will recognize some familiar faces like Derek Hough and Karina Smirnoff.
PHOTOS: Dancing with the Stars season 21 professional dancers
Dancing with the Stars season 21 premieres Sept. 14 on ABC at 8 p.m. ET | 7 p.m. CT.