Drew Lachey previews the new season of 'DWTS'

Lachey appears live on "GMA" to tell fans what they can expect on the next season of "Dancing With the Stars."
3:56 | 09/18/17

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Transcript for Drew Lachey previews the new season of 'DWTS'
And we move on to "Dancing with the stars." It premieres tonight and our special correspondent former "Dancing" champ drew lachey is giving us an exclusive behind the scenes sneak peek as his brother, Nick, prepares to take on the ballroom. Take a look. ??? Reporter: The 25th season of "Dancing with the stars" has arrived. And it's a family affair. My brother Nick couldn't resist giving me a hard time. This is the best you could come up with, right? I know. Times are tough. Reporter: Rehearsal is like one big family reunion. Nick's wife Vanessa is competing against him dancing with Maks married to PETA, Nick's partner. My husband is with another woman bumping and grinding. I'll have to be okay with it. Reporter: Separating home and ballroom can be a challenge. He showed you his first step already. I know. You didn't keep the mystery. I showed nothing to PETA. Either we'll be on the same page in sharing information with an enemy or we'll be on the same page with like, oh, yeah, this is what we do. Reporter: You see set pieces going in, light, people rehearsing, everything is rehearsed. Down to the judges' scores. Yes. Let's get scores. Reporter: This place is a well oiled machine. From "Shark tank" to the dance floor. Show them how you look at me when we dance. He looks at me like that. Look away, people. It's not safe for morning television. ??? I get lost ??? ??? in your arms ??? Reporter: Debbie Gibson had to get used to hearing her own voice in a big way. Really. I'm dancing to mie own song. Kind of a full circle moment. It came out 30 years ago. Reporter: The woman who taught me to dance, the very talented Cheryl Burke. Drew and Cheryl. Reporter: We won back in season two. You're used to having some outspoken coaches and teammates. Absolutely. Are you saying I'm outspoken. I'm saying you're too spoken. Reporter: PETA says my brother already has a nickname. Pops because he's the oldest in the competition. Pops. It's cops from you being old. Oh, drew. He joins us from L.A. You danced twice. Season 2 and 15. You are know what they're going through right now. A lot of butterflies. A lot of pretty fierce rehearsals. Yeah. Yeah, I guarantee you right now they're starting to freak out. The show is today. They're just thinking please don't let me go home first. Let me remember the steps. So there's a lot going on in their heads right now. Between Nick and Vanessa who is more nervous. I say probably Nick because there's the sibling rivalry in there too. He has an expectation to live up to. Between Nick and Vanessa can you go ahead and make the tough decision and tell us who is going to do better? Oh. That is going to make for awkward holidays. So I don't know if I'm comfortable with that. They're beet going to do well. Okay. Pull back. Yeah, we're only 60 days from Thanksgiving. I think that's very smart. Pull back. How about the whole cast. Who do you like? Well, Victoria and Val. All in all this is one of my favorite casts to watch. I just watched them in rehearsal. It's going to be a tough season for the judges. What is it about this cast that stands out to you? I think it's just the variety. Obviously, you know, Victoria and Val. Her story of coming from the paralympics to learning to walk again and now she's on didn't to Nick and Vanessa and that story line, as well, Debbie Gibson, you know, you got a lot of people out there with some pretty significant fan bases and you can't take for granted the strength of their partner's fan bases as well. Good point, Nick. When we come back, Lara is in

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

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