Scarlett Johansson on Motherhood Being 'Overwhelming'

Part 1: The new mother and recently married actress talks to Barbara Walters about her private life.
8:33 | 12/15/14

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Transcript for Scarlett Johansson on Motherhood Being 'Overwhelming'
First up is a woman whose name you know, a woman you have watched in movies since she was a little girl. And yet, I will bet you can't tell me three personal things about her. In fact, Scarlett Johansson plays things so close to the vest that I did this entire interview thinking she was engaged. In fact, she had gotten married one month prior in a secret ceremony, so secret, it seems, she forgot to tell me. This year, Scarlett Johansson conquered the all-boys club of superheroes. Hang on! Walters: She played black widow from marvel comics, the world's biggest action-movie franchise. Engine room's secure. Walters: And in the film "Lucy," she showed that a woman can do anything to a man that a man can do. Hey. Walters: In real life, she's playing a slightly more traditional role. She's engaged -- make that married -- to French writer Romain dauriac. And she's a mom to their 3-month-old baby, rose Dorothy. You just had a baby girl. What's it like for you? It's wonderful... And exhausting. You know, the love is just unbelievable. It's very overwhelming. Do you take care of her yourself? I do. Really? Yes. The whole bit -- the diaper change, the...? The whole bit. Yeah. I'm nursing and I love it. I love it. It's the best way to get back in shape. And what a shape. Scarlett Johansson is a full-fledged old-fashioned movie star. She's glamorous but down to Earth, natural but naughty, savvy but sensual, and above all, sexy. Did you mind being thought of as, "Sex, sex, sex"? I never put on a sexy face. So I don't know. I don't know -- you know, I don't know what it means to be -- to act seductive. Do you like your body? It's an okay body, I guess. I mean, I wouldn't say it's particularly remarkable, though. Any part you don't like? I don't like, you know, my thighs, my midsection, but... From where I'm sitting, it looks okay to me. Yeah, well, who can com-- I mean, I'm not gonna complain. I've gotthighs and a midsection, so I'm happy. You have said that you don't want to be thought of always as an object of desire. What would you like to be thought of? I think an actor for hire. Both: Today is April 18th. Walters: As her home movies show, that's always been Scarlett's goal. Oh, and this is a new tap-dancing step that my... Walters: Born in 1984, Scarlett grew up in New York City with her twin brothers and two older siblings. ? I am proud... ? Walters: She loved to sing and dance around the house. ? Having a girl ? ? like ? ? me ? you wanted to be an actress from the time you were very little. Really little. Like 3. My mom is a film buff, and so I watched a lot of, you know, Rodgers and hammerstein musicals and films with Judy Garland. And I loved auntie name. And I think I just escaped into them. And I wanted to be a musical-theater actor. Did you sing then? Yeah, I sang. Oh, okay. Do something for me. When I was 7 or 8, I was auditioning for musicals, and so I sang "Bali Hai." That was one of my -- that's not easy. Do a bit. Oh, god. ? Most people ? wait. I can't. I have to think about it. ? Most people live on a lonely island ? ? lost in the middle of a foggy sea ? ? some people long for another island ? ? one where they know they would like to be ? ? Bali... ? You stopped before the hard part! If I was in the shower, I would sing it so loud right now. At first... Walters: By age 8, Scarlett was landing small film roles. Scarlett Johansson. 9. Walters: Here she is auditioning, unsuccessfully, for the movie "Jumanji." Would you forget about the stupid game?! Now, close it up and put it away! How did you handle rejection? When you're auditioning that much -- as much as I did when I was a kid, you get rejected most of the time. I was very competitive, and I think I always had this weird -- I don't know, I felt like it was their loss, kind of... How nice. But the truth is, rejection didn't last long. Scarlett played a series of too-smart-for-their-own-good teenagers in several independent films. But her breakout role came at age 17 in the low-budget film "Lost in translation," opposite bill Murray. I just don't know what I'm supposed to be, you know? Most child actors have trouble transitioning into the adult roles. That didn't happen with you. Very fortunately, I think I -- you know, I found sort of a niche in independent film, which is much more forgiving, I think, than mainstream film. And then she found thisniche. What's the secret of doing a realistic sex scene? Uh... I won't ask you to do it for me here. That's okay. We'll have to step in the back. You have to be totally, you know, without judgment. And it's sort of liberating. It's challenging. You just got to stay in the moment. Scarlett bears it all on film... But in the real world, she holds something back for herself. Your private life is very private. We don't read a lot about you. You're not in the tabloids. How do you manage that? You know, I live a pretty low-key lifestyle, and I've always held my cards sort of close to my chest when it came to my private life. Occasionally, you know, there's been little outbursts here and there. One of the few times her private life went public was her two-year marriage to actor Ryan Reynolds that ended in 2010, four years before her current union. You have said you, "Don't think human beings are monogamous by nature." Do you still feel that way? Um, I don'tthink human beings are monogamous by nature. I think being in a committed relationship takes work. You know, it's very easy to kind of leave a situation when it gets uncomfortable. It's -- it's challenging. But when it works, it's really worth it. You have been open about being in therapy. Are you still in therapy? I am. You know, and then I can say, "Well, but, you know, you got a baby. You're a big star. What's your problem?" It's the perfect time to be in therapy, when everything's going well. What's the biggest misconception about you? I don't know. You have to tell me. What do you think? Well, I think because you played so many sexy roles that it may be forgotten how good an actress you are. Well, that's very kind. I was gonna say that I was tall. How tall are you? I'm 5' -- well, I would say 5'4" on a good day. No, you aretiny. No, but even looking at you, you look tall. Good! Do you have a philosophy by which you live? Um, I would say what I'm learning is that with every gain, there's a loss. And with every loss, there's a gain. It's easy to interview and talk to you. I wish you everything good. It's a pleasure. Thank you. Thank you. Next up for Scarlett is the sequel to "The avengers," where she will once again portray black widow. "Avengers: Age of ultron" comes out in may of next year.

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

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