Spears: It's a teen movie, but it's talking about real issues that teenagers deal with all the time. One of the girls has an eating disorder. One of the girls was date-raped, one of my best friends [in the movie]. I'm always wanting to please my father [in the movie]. I want to do what he wants me to do when I should just do what makes me happy. The whole movie is about this journey that the three of us best friends take, finding ourselves and what we want out of life and getting our friendship back. Friends are all you have at the end of the day. When your boyfriend breaks up with you, who do you call? Your girlfriend. I just love that message. [RealVideo]

MTV: Are we going to see you singing in the movie?

Spears: There's a lot of music in it. It's a road trip, so we're always listening to rock music, fun music, pop music.

MTV: Will your album have any tracks from the movie?

Spears: Yeah, "Overprotected" and "I'm Not a Girl."

MTV: Everybody who shoots movies talks about how you have to wait hours between scenes. Was that hard for you?

Spears: Yeah. It's totally different than what I'm used to. I'm used to being on the road and touring, [going] here, there. It was a very good experience for me, because I got to slow down a bit. There's a lot of waiting around, which was good for me. I did yoga and I read a lot of books. It was almost like a vacation.

MTV: Do you see yourself doing this in the future?

Spears: I would love to. I gained a lot of confidence. I'm so confident onstage, but it was my first movie. I didn't know what I was doing, but I proved to myself that I could do it. Now, with the next one, I'm like, "I really want to challenge myself."

MTV: Do you find similarities between your life and this character?

Spears: No. I think Lucy and Britney are very different, but there are some things that are similar. Lucy is very naive. She's very dorky. I hope I'm not that dorky, but she keeps to herself a lot. She writes in her journal a lot. I do that, too.

MTV: You recorded a song with your boyfriend, Justin Timberlake, for your new album. How was that?

Spears: Justin and [choreographer/songwriter] Wade Robson wrote it for me, and it's called "What It's Like to Be Me." It's a very cool song. It's very rock, and Justin did the background vocals on it.

MTV: How was it working together?

Spears: I was a little nervous at first. I'm used to going in there and it's like work. It was kind of awkward at first, 'cause I was nervous doing my vocals [in front of him] for some reason. I was like, "Ooh." But then, I totally forgot he was my boyfriend. I said, "Britney, just do the vocals. Don't be nervous. Don't be retarded like this." It ended up being fine, actually. At the very end, I got the very best vocals I've ever done. [RealVideo]

MTV: Sometimes when you work with somebody that is close to you, it can be a total nightmare. But they can also get the best out of you. It sounds like that's what happened.

Spears: Right. He definitely pushed me.

MTV: Did you learn something new about him that you didn't know through this process?

Spears: He's very good at doing vocals. [Laughs]

MTV: Do you have plans to work together again?

Spears: Definitely, in the future. I'd love to.

MTV: I heard he wants to act, now that you were in this movie. Do you guys have plans to do something together onscreen?

Spears: That would be cool, maybe in the future. We haven't really thought of anything just yet. We'll see.