Behind the Scenes With the Cast of 'DWTS' Season 19

Couples have their final rehearsal before the season premiere of "Dancing With the Stars."
2:47 | 09/15/14

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Transcript for Behind the Scenes With the Cast of 'DWTS' Season 19
shake shake shake ? Tonight is the big night. The premier of the brand-new season of "Dancing with the stars." The couples have had their final reversals. Our Melissa Rycroft went behind the scenes. ? Reporter: Tonight, just hours from now, the premier of season 19 of "Dancing with the stars." So many cameras. So many people. I love it. I'm having so much fun. Reporter: Tomorrow will be the finale already. I'm so nervous. Reporter: 13 scouples hoping to survive. A little nervousness. Reporter: Colorful cha-chas and fancy fox-trots. The first dance is romantic. Are you nervous? Piece of cake. Reporter: We surprised Tavis smiley with one of his own. I just want the face. Thank you "Gma." Appreciate it. Reporter: What are you hoping to accomplish? I want to show moms that it's not over. You can keep going. Show the world you got it going on. At 17 years old, you are officially the youngest competitor on "Dancing" the season. It's a little bit intimidated. It adds to the pressure. I'm excited about it. Reporter: You're if first youtube star that they have ever had. 7 million followers. 7 million on youtube. Reporter: All you have to do every night is go on your youtube channel and say, vote. It's the coolest thing ever. Reporter: Well, I have some blasts from the past to show you. What? No. Reporter: You had people rat you out. He's giving a slight eyebrow. He still douz that to this day in our number. It's that slight eyebrow. Reporter: Val chmerkovskiy fixing her posture. I'm pinching my back. I'm pinching my back. Every fife seconds it's this, this, this. Reporter: Veteran dancers are making announcements. As of now, this is probably going to be my last season. After doing something for a decade, I started when I was 20. I'm 30. I want to try new things. I want to see what is out there. Reporter: Tonight, they'll cha-cha. But Antonio sabato jr.'s 3-year-old son, an tow Yo iii, has already made up his mind. For "Good morning America," Melissa Rycroft, ABC news, los Angeles. And the big premier of "Dancing with the stars" season 19 is tonight at 8:00, 7:00 central on ABC.

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

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