It's very slippery: Kristen Stewart on playing Princess Diana in upcoming film

Hollywood star Kristen Stewart, who is gearing up to play Princess Diana in Pablo Larrain's upcoming biopic, believes the film is a poetic internal imagining of the UK royal's story, according to PTI.

Titled Spencer, the film will revolve around the Princess of Wales' decision to leave Prince Charles while holidaying with the British royals.

Stewart, who recently starred opposite Mackenzie Davis in the Happiest Season, detailed the project during in an interview with Entertainment Tonight.

"It's a really meditative project. There are so many perspectives of her and her story... it's just not a black and white thing and it's a very slippery, really emotionally-packed story for a lot of people," the 30-year-old actor said.

"This is a really kind of poetic, really internalised imagining of maybe the heaviest three days' time before she does something as gnarly as leaving the royal family. I'm just sort of reading everything that I can and then forgetting it, because it's kind of a really internalised story," she added.

In another interview with Jimmy Kimmel Live, Stewart said she was really young when Princess Diana died in a car accident in Paris in August 1997.

"It's hard not to feel protective of her. She was so young. Everyone's perspective is different, and there's no way to get everything right... what is fact in relation to personal experience," she added.

Larrain, whose directorial credits include the critically-acclaimed films Jackie, Neruda and Ema, will direct the film from a script by Steven Knight of Peaky Blinders fame.

He will also produce the film with Juan de Dios, Jonas Dornbach, Janine Jackowski and Paul.

Have something to add to the story? Share it in the comments below.