KEIRA Knightley has been tipped to star in a new version of 'My Fair Lady. The 'Pirates of the Caribbean actress is reportedly in negotiations to play Eliza Doolittle in Emma Thompsons adaptation of the classic rags-to-riches tale. Anne Hathaway and Scarlett Johansson are also being considered for the role, which was originally played by Audrey Hepburn. An insider said: Keira and Scarlett are the only two real contenders and Keiras the favourite. Shes the most natural Eliza people have seen. The films director Danny Boyle - who won an Academy Award for 'Slumdog Millionaire earlier this year - is also believed to want Keira to get the part. Expo The 24-year-old actress is said to be scared about taking on such an iconic role, but excited about the challenge it would present. Filming is expected to start late next year. Expo