Christie Brinkley's daughter hits the floor on 'DWTS'

Sailor Brinkley Cook stepped in this season after her mother injured her arm. Meanwhile, James Van Der Beek tops the leaderboard.
3:31 | 09/17/19

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Transcript for Christie Brinkley's daughter hits the floor on 'DWTS'
Now to our "Gma" cover story. That high-flying "Dancing with the stars" premiere. James van Der Beek tangoing to the top of the leaderboard and sailor brinkley-cook stepping into her mom's shoes and ginger flew all night. Lucky you. I love a good red eye. It's so nice to be here. Sailor brinkley-cook, I'm going to tell you we all have to get used to saying her name because she seamlessly jumped into the competition after her mom broke her arm in rehearsal. I think she has quite the future on the show. The light was shining too on James van Der Beek. An electric night on the dance floor, James van Der Beek nailing his dance with the highest score of the night. Whatever it takes Thank you. Reporter: Lew bass night it was all about sailor brinkley-cook dancing in place of her mom. After this devastating moment during rehearsal. Oh, my god, my arm, my arm. My arm. I think I broke my arm. I swear to god. Reporter: Her daughter stepping in. This has been such an emotional roller coaster. I have to say from the moment it happened, I hate disappointing anybody. I didn't want to disappoint Val, my family, my friend, you know. And I thought, what can I do? I have to find the silver lining and sailor ended up being the golden silver lining coming to my rescue. Reporter: Sailor starting the routine whispering to her mom, this one's for you. You are magnetic and have that radiance but there's something in you. Did you feel any of that tonight? It was for my mom and being up there and getting out of that car to "Uptown girl," I was like, seeing her face, she immediately like -- it made everything worth it. It made the rush of it all. Reporter: Her mom sitting on the sidelines cheering her through the routine that she had practiced for weeks. Sailor stunning after just three days. So proud. With only three days to practice, sailor, you floated my boat. You've got the look, you've got the light. But you have the talent. Reporter: Christie overcome with emotion. I wish I was still part of the cast not wearing one. But since it did turn out this way, the silver lining is just amazing. And these two just killed it tonight. In the most beautiful, beautiful way. She's definitely going to do well. But I have to tell you during dress rehearsals I was watching from above and somebody had a hat on. I thought is that gleb or one of the pros, it was James van Der Beek. That's how good he is, you guys. He is moving like -- I don't know if he does a lot of yoga. I saw his high kicks. His flexibility, the way he gets -- I don't know. He's -- super charming on top of that all. Mary Wilson also surprised me. I saw her dress rehearsal. She is a supreme. She brought it. Oh, yeah. I'm telling you, remember, she's 75 years old. Look at her. It's as if she's put on a show before. She's great. I loved watching all of it. "Dancing with the stars" airs Monday nights at 8:00 P.M., 7:00 central on ABC. You don't want to miss it. Of course, next Monday and that's where you'll find out how they'll do eliminations. Will you do another red eye? No, I'm done. It's over. All right, rob, over to you.

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

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