She dazzled on the red carpet but reviews for Naomi Watts' new film ''Diana'' have been anything but dazzling.

Within hours of the film's world premiere in London critics were calling it 'atrocious' and 'intrusive' - although there has been some praise for Watts' performance.

Looking striking in a Versace gown, the actress revealed she's concerned how the film will go down with Diana's family, in particular her sons Princes William and Harry.

(SOUNDBITE) Actress Naomi Watts (English), saying:

"I am concerned, I had my concerns going into it which is why I hesitated, but the film is done, whether or not they see it I have no idea, if they do I hope they feel that we have been respectful and upheld her memories in the best possible way."

'Diana' tells the story of the last two years of the princess' life, focusing on her secret love affair with Pakistani heart surgeon Hasnat Khan.

Ahead of the screening director Oliver Hirschbiegel said he hoped a love