'Dancing' Pros Maksim Chmerkovskiy and Peta Murgatroyd Go Undercover in Dance Class

The "Dancing With the Stars" pros were unrecognizable before dropping their disguises and shocking the dance students.
5:02 | 11/10/15

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Transcript for 'Dancing' Pros Maksim Chmerkovskiy and Peta Murgatroyd Go Undercover in Dance Class
series "Gma" undercover where celebs go in cognito to surprise their fans. Surprise, guess who it is? For our very first "Gma" undercover we put our dancing shoes on as Lara already -- Put it right up. Take a look at what happened. ? Maks. And PETA. Two former champions of "Dancing with the stars" and now our "Gma" undercover agents. The mission, disguise and drop them into an advanced theater dance class. I feel like this right here requires this. Did you see this. Man here. That's a lot of man. A little bit of this. A little bit of that. I want you to do as much as you can so she doesn't look at me and get aroused when we dance. The venue, steps on broad way dance studio. I definitely saw Maks when he walked into the class because he couldn't miss that stomach. It was like stomach first walking through the door. This is how I know when I'm old and fat I'm still going to be amazing. People will just stare. I noticed the stares that I was catching -- I was trying not to laugh at the people that were laughing at me. It was kind of hard to be off beat actually. It was 40 minutes of like you wait, you don't know what's about to happen. ? ? ? ? I was so surprised. This was everything. My mom is going to freak because she watches the show. It was amazing. I was half embarrassed, half having the time of my life. I was staring at you the whole time. I love you. And our man, Maks, come on, Maks. He's joining us live right now. You got big cheers here in the studio. What a great surprise. That was a great -- what was the reaction? What did you hear from some of the students after all that went down, Maks? First of all, I just want it to be on the record that I thought that we're going to be, you know, playing older couple and it'll be an older people's class, you know, like we'll blend in and then we walk in, we're literally 30 years ahead of the oldest person in the room and it's not even like, you know, beginning, inter-mediate. It's like full-on theater class of people that actually are on Broadway and performing right now so, yes, so it was like, okay, cool, just a little different. We definitely stand out. I was trying thought to laugh watching PETA be bad. It actually, you know, like what she said, it was hard to be off -- Was it? Because it's very easy for everyday -- easy for us to be off beat. Yes. But it's difficult for you to do that? It turned out to be a little hard. Also to keep a straight face and, you know, I immediately embraced my stomach and glasses and beard for some reason I wanted to be named bob immediately and when the instructor and so PETA chose her name and this is how you know she would probably be the worst person to be like some sort of secret spy. There was a moment when the instructor said, hey, now everybody turn around and introduce each other to your neighbor she turns around and goes, PETA, no, I mean -- Maks, we only have a few seconds left. You and PETA in sway. Who else can we expect to see coming up in "Sway"? We're luck to have Meryl back, rumor, a couple people from the show obviously Tony, Val, myself. Henry is going to be part of it again, we have a couple more surprises but overall it's going to be better than ever. Okay, but this was the best surprise that you did. Hey, Maks -- This was amazing. You're always good to us. Thank you. Have a great time. Glad you and PETA are doing so well. Coming up --

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

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