Keira Knightley would "s**t herself" if she won an Oscar.

?'The Duchess' actress, who has been tipped for Academy Award glory next year for her role in the period drama, is terrified at the thought of accepting the accolade if she does triumph.

She said: "I would probably s**t myself if I had to give a speech." Keira also revealed she was worried about accepting the role of Georgiana Spencer in 'The Duchess' in case people didn't take her seriously and she felt like a "w***er" wearing a wig.

The 23-year-old star added: "There is always an element of fear that you are not going to be able to make people believe in the fiction, that suddenly you are going to be standing there in your dress and wig, and feel like a complete w***er. Which is not particularly helpful."