They had elegance, they had grace and they were adored by millions.

They also each had untimely deaths in auto accidents. Now Princesses Diana Spencer and Grace Kelly also are the subjects of biopics coming out this fall. But will they be crowning achievements for everyone involved?

Here's an early look at the dueling princess pics.

THE MOVIE 'Diana' (scheduled for release in October)

HER HIGHNESS Aussie Naomi Watts as Lady Di

THE STORY It follows the last two years of Diana's life as she continued her charity work and campaigned against landmines, and focuses on her secret love affair with heart surgeon Hasnat Khan, played by "Lost" star Naveen Andrews.

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PREPARING FOR THE ROLE Watts, 44, moved into a flat in the London borough where Diana lived and visited her favorite hangouts, including Beauchamp Place and the Harbour Club. She also studied televised interviews of Diana to nail her speech.

ROYAL REACTION

Mum's the word so far, but Watts has said in interviews that one of her biggest hopes is that Princes William and Harry will be pleased with the film.

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THE MOVIE "Grace of Monaco" (scheduled for release on Dec. 19)

HER HIGHNESS Another Aussie -- Nicole Kidman as movie star-turned-princess Grace Kelly

THE STORY Set in 1962 amid political turmoil in Monaco, "Grace" has director Alfred Hitchcock hoping to lure Kelly back to the screen for his movie "Marnie." Her thoughts of a comeback create tension between her and Prince Rainier (Tim Roth).

PREPARING FOR THE ROLE Kidman reportedly studied French, and designers have made exact re-creations of many of the gowns worn by Kelly, who was famous for her fashion style.

ROYAL REACTION Early buzz from Monaco has not been encouraging. The Telegraph reported that Prince Albert has called the movie "needlessly glamorized and astoundingly inaccurate." Princesses Caroline and Stephanie added that numerous requests for changes were ignored and the screenplay "had caused much astonishment."