Scarlett Johansson is determined to fight the aging process with plastic surgery, once her youthful looks start to deteriorate.

The LOST IN TRANSLATION star, 21, is willing to go under the knife if necessary, but believes that beauty can also come from within.

She says, "Oh I definitely believe in plastic surgery. I don't want to be an old hag, there's no fun in that.

"But I think if you're comfortable with yourself then that's sexy.

"Maybe people think that I look sexy because I feel sexy."