The documents from German movie studio Constantin Film suggested the "Harry Potter" star had been cast as the racy book's adventurous college student Anastasia Steele. Watson has now taken to her Twitter page to respond to the speculations, reports contactmusic.com.

"Who here actually thinks I would do 'Fifty Shades of Grey' as a movie? Like really. For real. In real life. Good. Well that's sorted then," she tweeted.