Scarlett Johannson has admitted that she often worries about her appearance.

The Hollywood star insisted that she does not regard herself as sexy, but added that she is learning to be more confident about her looks.

"I think sexiness is a function of one's self-confidence and feeling comfortable in one's skin. I'm attracted to men who can exude a kind of sexual energy like that," Scarlett is quoted by the Daily Record as saying. "But I don't think of myself as sexy."

"I'm becoming more relaxed and accepting of my looks and I try not to worry about not being super-thin or not having long legs," she explained. "I tend to see flaws in my appearance. It's sometimes a healthy thing not to be too enamoured with yourself, especially if you're an actor.

"I also pose for photo shoots and that gives me more confidence when I see myself on billboards. I shouldn't complain."