Diana is a 2013 biographical drama film, directed by Oliver Hirschbiegel, about the last two years of the life of Diana, Princess of Wales. The screenplay is based on Kate Snell's 2001 book, Diana: Her Last Love, and was written by Stephen Jeffreys. Australian actress Naomi Watts plays the title role of Diana. The world premiere of the film was held in London on 5 September 2013. It was released in the UK on 20 September 2013. The film received negative reviews from both British and American critics.