Naomi Watts is seen for the first time as Princess Diana in the new trailer for the biopic Diana.

The actress recently confessed that her part in the film, which concentrates on Diana's life shortly before she was killed in a car crash on August 31, 1997, was “the hardest thing I’ve ever done.”

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Naomi, 44, took her duty of portraying the princess very seriously. “I don’t want to get caught up in mimicry—that’s the worst thing,” she has said. “I was to try to embody her and get the essence of her. Those things are really important to me.”

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Diana will hit theaters in September.

What do you think of the trailer? Will you go see the movie? Let us know in the comments section or on Twitter @OKMagazine.

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