ABC/Ida Mae Astute(NEW YORK) -- The full cast of season 21 of ABC's Dancing with the Stars has finally been revealed. Don't Be Tardy star Kim Zolciak, singer Chaka Khan, jockey Victor Espinoza, and Bindi Irwin, the daughter of the late Crocodile Hunter star Steve Irwin, are among the celebrity contestants. They told ABC Radio why they decided to compete for the Mirrorball trophy.
"I've been asked a few times before to do the show," Zolciak explained. "[But] I just had had a baby or I'm filming Don't Be Tardy. This year the timing is perfect, and I'm excited. I'm up for a challenge. I'm not one that really can dance so it's a challenge. It's something new, fun. I'm super excited."
Khan, whose career has spanned four decades, said she joined the dance competition because she's "done everything else! You know, I thought why not? It'd be something new and interesting."
Espinoza is trying to repeat the success he's had as a jockey, riding Triple Crown winner American Pharoah, but admitted dancing is a bit out of his element. "I mean, it's different, something that I've never done before. And honestly, I've watched that show before and I was making fun of all the one's that starred [before] and look where I am!" Espinoza said, with a laugh. "Everyone's gonna make fun of me now."
Irwin isn't focusing on the competition -- right now, she told ABC Radio she's enjoying the camaraderie. "It is a real team effort and being able to work with such beautiful people; we're this huge family," she said. "It's not really that we're competing against each other. We're kind of just working together to achieve greatness to do the best job we can."
"This is such a new journey for me. I'm a girl from Australia, who lives in the middle of a zoo, trying to spread my message of wildlife and conservation," she added.
Also on Dancing with the Stars are husband and wife Carlos and Alexa PenaVega. The celebrity couple admitted it may be hard to turn off the competition at home, but explained why it was worth the risk.
"It's such a blessing that we can do it together because it's very taxing on the body and on any relationship. Because you're constantly in rehearsal, you're spending so much time away from your other half," said Carlos. "So the fact that she's next door and I can pop into rehearsal, it's amazing! And I know what's she going through. So I think having this experience and doing it together, and it's something we can share with our kids in the future; that was a big reason why we were like let's do this! Let's do it together."
Judges Julianne Hough, Bruno Tonioli and Carrie Ann Inaba also will return to Dancing with the Stars. However, as previously announced, Len Goodman is sitting out this season. Host Tom Bergeron told ABC Radio reports that Goodman is "leaving the show have been greatly exaggerated -- [it's] just for the fall." So why is Goodman sitting out this season?
"That was because of the incredible burden really of judging the show in England, which Bruno still will be doing," explained Bergeron. "Then he and Bruno in past seasons would fly all the way from London [to judge Strictly Come Dancing, the U.K. version of Dancing with the Stars] to the States, to L.A., do our show then fly right back to London. So Len decided he needed a break from that, but we have every hope that he'll back with us in the Spring..."
A rep for Goodman added he's taking time off due to the recent birth of his grandson. The show will feature guest judges in his place, though he's Goodman expected to pop up now and then this season.
Season 21 of Dancing with the Stars, co-hosted by Bergeron and Erin Andrews, premieres Sept. 14, on ABC at 8 p.m. Eastern.
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