Naomi Watts Is Princess Diana

While the royal family, including Prince William, Kate Middleton, Prince Harry and even Queen Elizabeth II herself, are all participating in activities having to do with Olympic sports, Naomi Watts, 43, is filming a biopic about one of their own, the late Princess Diana.

Watts is filming the Oliver Hirschbiegel-directed, speculatively titled Diana, about which little is currently known, in Hemel, England, and her transformation is already getting everyone's attention. "An awful lot of pressure comes with [the role]," Watts told Australia's News.com. "I was dreading people saying, 'she looks nothing like Diana,' and 'why her and not somebody else?' But I couldn't not do it," Watts explained of her choice to play the legendary Princess of Wales, Diana Spencer, who died in a car accident in 1997 at the age of 36.

No one is saying that now. "It's scary," said Hirschbiegel of Watts' performance. "Sometimes it's as if you're watching the ghost of Diana."

Watts wears a prosthetic nose and a variety of wigs for the role, reports Vanity Fair. But perhaps the most compelling part of Watts' transformation has to do with a her wardrobe for Diana, which consists of custom-made designer replicas of Diana's old dresses. There are even a few of the ensembles that belonged to Diana herself.

Diana is expected to open in certain parts of Europe in February 2013. A U.S. release date for the film has not yet been determined.