NEW YORK — When Naomi Watts was a struggling actress, she never would have imagined that one day she would play Princess Diana, one of the most famous women in the world, even after her death.

“Yeah, that would sound a bit silly wouldn’t it,” the actress said at the New York premiere of the biopic “Diana” on Wednesday night.

Watts plays the Princess of Wales during roughly the last two years of her life. The story is based on the 2001 book “Diana: Her Last Love,” chronicling her relationships with heart surgeon Hasnat Khan and Dodi Fayed.