Rumer Willis has hit back at critics who have mocked her prominent chin, insisting the imperfection makes her a role model for insecure young women.

The 19-year-old daughter of actors Bruce Willis and Demi Moore has been mocked by internet gossips because of her facial features.

But she has learned to deal with the jibes, and hopes her positive self-esteem will inspire others to accept their own flaws.

She says, "Everybody has an opinion, and we live in America so you're allowed to.

"Hopefully, young girls will watch (me) and feel confident about themselves and go, 'OK, that girl's not entirely the ideal of what a perfect picture is supposed to be and she feels confident and beautiful, then I can too.' If we can have the ability to do that, I'm very excited about that.

"As long as you are comfortable with who you really are and your friends, and the people that are around you know that, that's all that really matters."