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Naomi Watts just got a royal makeover!

The British-born actress -- who moved to Australia in her teens -- was spotted on set of her latest film today, where she was seen in costume as Princess Diana for the first time.

Watts, 43, is currently filming "Caught In Flight," a movie about the final two years of Princess Diana's life.

With the short blonde hair, glamorous gown and pearl necklace, Watts is doing a pretty good job transforming into Diana, isn't she?

Check out which other stars have tackled playing a real person in the gallery above!

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