Britney Spears: On Tour, Newly Single and Partying in Vegas

How the pop princess juggles her career and motherhood, while still having a good time.
2:56 | 09/12/14

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Transcript for Britney Spears: On Tour, Newly Single and Partying in Vegas
Britney spears inc is a business worth billions. And tonight, this mogul is adding a whole new hat to her collection. Oh, and gentlemen -- she's single. Here's ABC's Michael Strahan. ? Let's go ? This is in slave. Hip, hip -- no, on your hip. Reporter: If you get the chance to dance with Britney spears, you take it. But as I learned, dancing like the pop princess is no easy feat. Okay, so, we'll just do that much, just for right now. That much? That was ten steps further than I can remember. Britney, play football, I got hit in the head for a long time, girl. I can't remember anything but two steps. You show me yours. Reporter: Mine? Yeah. I love that. That's -- that's -- I'm speechless. Reporter: That's all I got. In her indelible words, you want to dominate the dance floor, you better work. Spears has been hard at work in Las Vegas, bringing the iconic moves and unstoppable anthems to her two-year residency show, "Piece of me." ? I know you want a piece of me ? Reporter: It's been challenging for you? It has been. There's a lot of days where I'm like, okay, I don't want to do a show today, I make myself get up -- I know that feeling. It's fun. I'm vk a lot of fun doing this show. Reporter: Offstage, brit's been deeming with the end of a relationship with David lucato. The two have been together since March of last year, and she's been open with her fans about the breakup. You spoke about being single and breaking up on stage, and then you tweeted, ahh, the single life. The single life. Reporter: Give me some of that. Bravery at its best right there. Yes. Reporter: Now spears is putting her own spin on the mantra, work hard play horde. How is it being single in Vegas of all places? It's mind-blowing, like, you know, my mom is like, you need to date three or four different guys at one time and just have a lot of fun. And I'm like -- mom. We're not that old school anymore, you know what I mean? I guess I could try to do that, but -- I don't know. It's fun. It's a lot of fun. Reporter: So, what's a single girl's best weapon on the battlefield of love? Great lingerie, of course. Tomorrow is a promise awaiting to be kept. Reporter: It's her new line called, what else, the intimate Britney spears. This will look good on me. Reporter: That would look good on me? What side of your creativity did you have to tap into for this new line? Ten years ago, I was in Europe and I went to this vintage, artsy, really cool small boutique store of all these lingerie and sleepware lines, and I was like, I want to do this. Reporter: Fitting for a woman who has made us a slave for her music. And whose most famous looks involve the least clothing. Now, the mother of two, music mogul and perfume per say your is doing it again. ? expanding her empire so we all can get a little closer to Britney, while we wait for her next album. We need some new anthems. Are we going to get some? Yes, you are. Yes. Reporter: Can't come soon enough. For "Nightline," I'm Michael Strahan in New York.

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

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