Keira Knightley has refused to star in the movie adaptation of the award winning erotic novel 'Fifty Shades Of Grey,' after her raunchy experience filming 'A Dangerous Method.'

"I normally don't like to give a definite about anything but I can definitely say it will not be Fifty Shades Of Grey," the Daily Express quoted her as saying.

And while 60 million copies of the books have been sold worldwide, the 27-year-old actress is not keen to follow the trend.

"I haven't even read it yet. I mean, just from [what I've heard], friends who've got into it and I've gone, 'No'," she said.

"I did A Dangerous Method and that had a bit of all that in it. I don't think I need to do it again," she added.

The film of Fifty Shades now has a writer attached, although there is no date for the start of filming. Amanda Seyfried, Justin Bieber, Ryan Gosling and Emma Watson have all been mentioned as possible contenders for the main roles. According to a report in Times of India.