Keira Knightley has vowed never to have plastic surgery.

The screen beauty insists that she would never go under the surgeon’s knife just to improve her appearance. She was put off by popular TV show ‘Dr 90210′ which documents real-life cosmetic operations.

Keira was quoted as saying, “Plastic surgery is brutal. There’s this awful show, ‘Dr 90210′, that shows people doing plastic surgery and it’s brutal.

It kind of makes you go, ‘Are you all mad?’ I couldn’t go through with it, I’m not into pain and all that,” she added.