Pride And Prejudice star Keira Knightley has fans terrified that she has dropped to a perilously low weight.

The 20-year-old knockout showed up at the British Independent Film Awards on November 30 looking like she hadn't eaten for weeks. Her stomach was so flat it looked like a washboard.

But Keira, who also starred in Pirates Of The Caribbean and Love Actually, said in a recent interview that she does not diet and eats whatever she wants. "I don't think about nutrition," she added.

The bombshell actress' new super slim look comes as she emerges as the front-runner for an Oscar her role as Elizabeth in the just released Pride And Prejudice.

Keira has also revealed that she's concerned about her looks and may have plastic surgery. She told reporters: "I know that my looks won't last forever. In five years' time I will probably already be past it and having Botox, facelifts, nose jobs and false hair."