Rumer Willis hopes her new flick, The House Bunny, will help young girls feel confident about themselves.

LOS ANGELES -- Rumer Willis has much to be grateful for.

"I'm in Adam Sandler's first female-driven comedy, it's a really big deal," says the daughter of Demi Moore and Bruce Willis of her first feature film, The House Bunny.

"And to be a part of something that could hopefully allow young girls to feel confident about themselves, to go, 'That girl is not entirely the perfect picture of what a girl is supposed to look like, and if she feels confident and beautiful, then I can too.' I'm very excited about that."

And yet, there's what seems like a sadness to Rumer Willis. She has reflexive tendency to look at the floor. She's articulate, but speaks tentatively.

But she's not evasive. A self-described "computer geek" who turned 20 just last Saturday, she is obviously no stranger to the Internet and the cruelty that is expressed there, especially toward celebrities and, unfortunately, to their offspring.

Rumer Willis is pretty. But she is not one of the most beautiful women in the world, like her mother. "Growing up in Hollywood and having two younger sisters, there's so much pressure I think from everywhere to look a certain way and dress a certain way. I definitely know I don't fit the convention."

Of the bloggers and celeb-watchers, she adds, "Everyone has an opinion, and in America you're allowed to have one."

The media are a "very interesting" bunch, she says, because they create an image of "who they think you are, an idea of you. But it might not necessarily be who you really are. And as long as you are comfortable with who you really are, and your friends know that, then that's all that really matters."

Somewhere that moral is to be found in The House Bunny, in which Anna Faris plays Shelley, one of Hugh Hefner's inner-circle of Playboy Bunnies, who gets herself expelled from the fabled Mansion and manages to land a job as House Mother at the least-popular sorority on campus. In fact, Zeta House is so full of geeks and misfits, it's in danger of losing its charter for lack of ability to attract new members -- forcing Shelley to conduct a crash course in popularity, "hotness" and attracting guys.

Among the misfits is a bookworm (Emma Stone), a pregnant girl (Katharine McPhee) and Joanne (Willis) a disabled girl in a neck brace.

"It's very difficult, and I have a lot of respect for those girls in high school who had to wear those things," Willis says. "Sometimes, I'd see Katharine lounging about (in her preggie pad) and everybody on the couch and I'd always be sitting on a stool perfectly straight. I actually couldn't get up one time. I was like a turtle. I was lying outside on a blanket, and our director came over and we were talking and I tried to get up and I couldn't. And he asked me if I was kidding and I said no.

"But I had a lot of fun with it. I wouldn't let the props guys take it back from me in the end."

Although Willis has had bit roles in a few of her parents' movies (Demi's Striptease and Bruce's The Whole Nine Yards), most of her experience has been on the outside looking in.

"I've wanted to act as soon as I got on a movie set," she says. "But it's a big shift in your mind when go from being the accessory to the one in front of the camera. I'd kind of sit in the trailer and hang out."

Of her high school years, Willis says, "I was a big dork, I was kind of a computer nerd, braces and glasses and I had this big curly 'fro. I wasn't too active getting into the social crowd. So I definitely understand not entirely fitting in. Everyone has their own version of feeling out of place."

These days, Willis says she feels motivated to act. She has a role in Rob Schneider's next movie, Wild Cherry, and enjoys the full support of all three "parents" -- Demi, Bruce and Demi's current husband Ashton Kutcher.

In fact, Rumer raves about the unusually relaxed family situation, that sees the entire extended family vacationing together.

"I am probably one of the luckiest girls around," she says. "I get to share holidays, and my family is a role model for many other people. I don't think I would be the same person without it."

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