Jessica Alba insists she is a "real prude".

Speaking in the new issue of Loaded magazine, she said: "I think a lot of women with children are sexy. It's weird thinking that because you have children you don't have ownership or you can't have sex appeal.

"You don't stop becoming a woman, that's for sure. And it does make me laugh when my name appears in those 'sexiest actress' polls because that is just not who I am.

"Everyone who knows me well knows that I am a real prude!"

Jessica reprises her role as stripper Nancy Callahan in 'Sin City: A Dame to Kill For' - the sequel to the 2005 movie - but she doesn't taking her clothes off for movie scenes and has a nudity clause written into her contract which states she won't be stripping for her roles.

She added: "It is make-believe. I am not naïve about the way Hollywood works. I know that sex sells movie tickets. But a good director can make a scene sexy without me taking my top off."

The latest issue of Loaded magazine - with Pharrell Williams on the cover - is available to buy now.