Screen siren Jessica Alba wants to be a role model for curvy women, because she's proof you don't have to be skinny to be sexy.

The 24-year-old actress is proud of her voluptuous figure and hopes she can encourage younger girls not to diet.

She says, "At the end of the day I just had to think that girls who have curves and aren't the skinniest things in the world are going to feel more comfortable seeing me as the main character than someone else.

"So I had to just think that maybe I would help young girls with their body image."