Jessica Alba is a self-confessed "goofy dork".

The 'Into the Blue' star - who recently topped FHM magazine's annual 100 Sexiest Women in the World poll - has laughed off her sex siren status.

Jessica told InStyle magazine: "People think of me as just a sexy girl but I'm really goofy - super goofy!"

The 26-year-old actress also revealed she was an early developer which led to her landing sexy parts from a young age.

She explained: "I had womanly curves at a young age. Usually kid actors are a few years older than the roles they play. I was two or three years younger."

The 'Fantastic Four' star also admits she has a rebellious streak and gave her parents a rough ride.

Jessica said: "I love challenging authority. It probably wasn't easy being my parents. The second somebody says no to me is the second I'm going to jump up and say yes."