Behind the Scenes of 'Dancing With the Stars' Season 21

Inside the final rehearsal as the stars prepare for tonight's season premiere.
2:54 | 09/14/15

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Transcript for Behind the Scenes of 'Dancing With the Stars' Season 21
the stars." The new season kicks off tonight. Rachel smith wept behind the scenes for the last rehearsal. ? Reporter: Dancing stars and thousands of their fans shutting down Hollywood boulevard. I feel more comfortable with a giant snake than out here. Reporter: Here is the ballroom. We spotted bindi's mom and brother watching her last minute rehearsal. And Chaka khan. You get one chance, one dance. One dance. One time. I'm so happy. ? I think I love you ? Reporter: Some of the stars overwhelmed. Pi first time here. It's unreal. This is crazy. I mean, the starting at 6:55 eastern. Coming up, we go behind the scenes with "Dancing with the stars." Bindi Irwin, nick car all the starts getting ready for tonight's huge premier. Stay with us. Like, you can be proud of me on this journey on "Dancing with the stars." Reporter: Paula Deen lost 40 pounds before agreeing to dance. I just want to do the best I can for everyone that I love. My mom passed away six year ago. Doing something like this show, where I'm thinking about her every single day has been really sweet for me. Reporter: Dance lessons turning into life lessons. She's gt a great heart. Aw. Only because I cried. Reporter: Already? Kim, bring it in. Okay, I need it. Reporter: Triple crown winner victor Espinoza is learning to give up the reins to the dance teacher. She's the jockey. She treats me like the horse. Reporter: Are we going to see a different Gary Busey on the dance floor? Every ten minutes there's a different Gary. Reporter: For "Good morning America," Rachel smith, ABC news, Los Angeles. Gary Busey will make it interesting. Must see TV. Who else are you watching? Bindi and Derek. I'm so pushed F pumped for them. I'm rooting for my fellowskarlatos. Coming up, Leona lewis is

This transcript has been automatically generated and may not be 100% accurate.

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