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Naomi Watts recently finished shooting the biopic Diana, about the late first wife of Prince Charles, who died in a car crash in 1997.

"The film focuses on the last two years of her life. It was an experience. It's a high-risk project as well," Watts tells us.

So what made her say yes to playing one of the most famous and infamous - and scrutinized - women in the world?

"I was petrified but intrigued. She's a fascinating woman full of complexities and contradictions - all the kinds of women I like to play and surround myself with in real life," says Watts. "She was a rebel. She was very isolated. She didn't trust anyone. It's a fascinating story."

She's aware that not everyone may greet the film with open arms, particularly Diana's two sons, William and Harry.

"The boys are still around. It's more recent than perhaps some people would like. It's a story that had to be told. And it's a story that would be told at some point," says Watts, herself the mom of two sons.