Sarah Michelle Gellar won’t do nudity. And Jessica Alba has said the same thing. But one young Hollywood starlet will strip for the cameras if the part calls for it. ’Sexiest Woman Alive’ Scarlett Johansson even demands it.

The buxom 21-year old has said that she’s loyal to her sweetie Josh Hartnett. "Josh is very sweet," the 21-year-old actress says in an interview in Allure magazine’s November issue, on newsstands October 24. "He’s a good boy. A great person. I’m very lucky and I’m very happy. Contrary to popular belief, I’m not promiscuous.

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But she is a professional and wants to go naked if she is in a sex scene as happened during the Island.

MSNBC columnist Jeannette Walls points out that Scarlett has no problem showing the goods.

She was reportedly furious when she was told to wear a bra during a bed scene in “The Island,” according to Michael Bay, the director of the flick.

“Scarlett said, ‘I’m not wearing this bra. I’m going naked,’” Michael Bay told the London Mirror.

“And I said, ‘Scarlett, you can’t go naked - this film is PG!’” Johansson explained, “They wanted me to wear a bra when I woke up. Nobody sleeps in bras - except maybe French women.”

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We know what you are thinking - why didn’t they fire that director?