See first photo of Kristen Stewart as Princess Diana in 'Spencer'

A first photo of Kirsten Stewart in character as Princess Diana has been shared online.

In the image, the Twilight star embodies the late Princess of Wales, wearing a read coat over a black pussy-bowed, polo-necked top, with a black veiled hat. The brunette actress's hair has been cut to almost perfectly recreate Princess Diana's shaggy blonde bob.

She appears to be staring out of a window in the shared shot, and, by the looks of the light green walls and ornate cornicing, it is safe to assume she is in a palace.

Stewart is playing Princes William and Harry's mother in Spencer, a film which is being independently made and directed by Chilean filmmaker, Pablo Larrain. The actor playing Prince Charles, heir to the British throne, is yet to be announced.

The biopic will detail the breakdown of Princess Diana's marriage to Prince Charles, according to Hollywood trade publication Deadline.

The movie, titled Spencer after Diana's maiden name, will take place over three days in the early 1990s when Diana made the bombshell decision to part ways with Charles and remove herself from becoming queen.

"When someone decides not to be the queen, and says, I'd rather go and be myself, it's a big big decision, a fairy tale upside down," Larrain told Deadline.

"How and why do you decide to do that? It’s a great universal story that can reach millions and millions of people, and that’s what we want to do.

"We want to make a movie that goes wide, connects with a worldwide audience that is interested in such a fascinating life."

Stewart's turn as Princess Diana comes fresh off the heels of Emma Corrin, the British actress who played the young royal in The Crown.

Of her career-making role as Princess Diana in season four of Netflix hit, Corrin has said: “I feel a lot of responsibility, I try not to think much about it, otherwise it does get overwhelming.”