If you think Keira Knightley is anorexic, you are wrong, says her mom who credits her slim figure to genetics and not a restrictive diet.

"She has always been thin," says mom. "She's her daddy's daughter, with his long body."

Apparently, Knightley, 23, eats like a horse to maintain her weight. A diet high in protein and carbohydrates is what reportedly keeps some meat on her bones.

On rumors that she's long suffered from anorexia, Knightley says: "I don't have it. I'm very sure I don't have it."

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