Spencer, the biopic centering in Princess Diana, has found its Prince Charles, Sarah Ferguson, and Earl John Spencer as the production shifts to the United Kingdom following months of filming in Germany.

According to Variety, Jack Farthing will play the Prince of Wales opposite Kristen Stewart's Princess of Wales. Farthing is best known for his work in the British period drama series Poldark.

Newcomer Olga Hellsing, on the other hand, will play Ferguson, the Duchess of York, Diana's sister-in-law, and the ex-wife of Prince Andrew, the Duke of York. Hellsing is a German actress, but she speaks fluent English.

Thomas Douglas has been cast as Diana's father. The British-German actor is a prominent figure in the German entertainment scene and has starred in the widely-acclaimed historical drama Labyrinth of Peace.

Spencer will cover just three days in Diana's life in December 1991 when her marriage to Charles was on the brink of completely breaking down further. The situation takes place at Sandringham, where members of the royal family reunite for their Christmas celebrations.

The Princess of Wales and the Duchess of York had known each other before they married into royalty. In Ferguson's autobiography, she said that she and Diana used to burn the phone wires as sisters-in-law, and they had inside jokes that no one in the royal family would ever understand.

However, their once-close relationship became sour in the final years of Diana's life. Ferguson said that in 1991, they both discussed who between them might leave the family. The York couple would divorce in 1996, the same year as the Wales couple. Diana would die in a car crash a year later.

Meanwhile, Spencer's production also released a new photo of Stewart as the Princess of Wales. The actress is made up with the same bob as Diana and has a prosthetic nose to look more like the royal. She's also pictured wearing a copy of Diana's famous engagement ring, which now belongs to Kate Middleton, the Duchess of Cambridge and Prince William's wife.

Also in the cast of Spencer are Sally Hawkins, Timothy Spall, and Sean Harris, but their roles have not been divulged to the press. The movie will also feature a young William and Harry, who were between the ages of eight and 10 when their parents separated.

The movie will be the first major feature film to be made about the Princess of Wales since the Diana biopic starring Naomi Watts in 2013. The screenplay is from Peaky Blinders creator Steven Night while Pablo Larraín' serves as the director.

Spencer is expected to debut later this year, a year ahead of the 25th death anniversary of Diana. William and Harry's mother was 36 years old when she died in August 1997.