The Oscar-nominated actress took on the role of the much loved princess in the recent biopic 'Diana', which told the story of her split from Prince Charles and her consequent relationships, and she's confessed that it may have been a mistake to make the film.
She told Harper's Bazaar magazine: "I got seduced by the fantastic character. Diana did a lot of things that had positive and negative results. She was multifaceted.
"But ultimately there were problems [with the film] and it ended up taking a direction that was not the one I was hoping for."
However, the 45-year-old star claims she doesn't completely regret doing the film as she knew from the beginning that it would be a challenge.
She added: "With risk there is every chance it's going to fail. If you have to go down with that sinking ship, so be it."
'Diana' - which was directed by Oliver Hirschbiegel - experienced an unsuccessful run in the box office when it was released in September last year and was further criticised when an advertising poster for the film was erected near the tunnel in Paris, France where Princess Diana and her boyfriend Dodi Fayed lost their lives in a car crash in 1997.