Julianne Hough Talks Working With Zac Efron in 'Dirty Grandpa'

The star actor shares what it's like on the set with Robert De Niro and Zac Efron.
3:42 | 01/18/16

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Transcript for Julianne Hough Talks Working With Zac Efron in 'Dirty Grandpa'
Test Text1 plain Here we are with dancer singer actress, Julianne hough. The cosmo cover girl and "Dancing with the stars" judge is at it again. Now multitasking in a new role. I wrote that and I can't say it. Multitasking the new role in "Dir "Dirty grandpa." Here's a peek. I found the tie you're going to wear Sunday to the rehearsal. Do you like the coral color or the salmon? Either one. What's wrong? Coral or salmon? What one do you like? I like the coral. That's the one I do. Okay. Cool. You're talking about a tie? So horrible. Yes. That was my fiance -- or I'm the fiance to Zack Effron and I'm the uptight fiance. I was like this is not an indication just so you know. Yeah. Congratulations. Thank you. Thank you. That's fun. Yeah. Art imitating life. But not. Because I hope that I'm not anything like that character Meredith in "Dirty grandpa" because she's quite awful. In real life you're engaged to brooks. Yeah. How do you say his last name? How far along are you in the planning? Have you chosen the tie color? No. It's salmon. Honestly I'm the worst bride ever. I haven't done anything. You're busy. A little. The movie comes out and I'm working on "Grease live" right now. Slow the role. Let's talk about dirty grandpa. What a treat it must have been to work with Robert de Niro. Pretty amazing. Who plays dirty grandpa. He's incredible. I had a bit of -- you know, I'm very nervous to meet him. He's Robert de Niro and I have to act cool and like I know what I'm talking about. I needed to go talk to him. I had no idea what I was going to say. I'm like do you like clemmentien and I'm like see you later. Awesome. You really broke the ice there. Before we go tell us about "Grease live." I would imagine that will be one of the most full filling experiences to be live on TV and what an epic show and you play the role of sandy. Pretty incredible. When you do a project you can usually look back on something and be like that was really special but it's not every day you start a project and in it and this is the most special things I've ever been a part of. Grease in general has been such a stay until our culture and in our lives and stuff. I just feel really honored and blessed. It's so much fun. I think the people that will be watching they'll be singing and dancing along. Yeah. It's amazing. How is your hand jive? It's great. We actually like kind of switched it up a bit. Yeah. Oh, yeah. Like kind of a modern day version of it. But yeah. If you know the original you can do that one, too. All right. We can't wait to see that. That's on fox airing? January 31 sglst dirty grandpa is in theaters are Friday. There you go. And "Dancing with the stars" one of the big judges and our big finale of the coat drive is coming up live.

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

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