The actor is set to play the late Princess of Wales in the new biopic, "Spencer."
The Duke and Duchess of Sussex will not be featured in the Netflix series.
The Crown Shares First Glimpse Of Princess Diana’s Wedding Dress And It's Just As Impressive As The Original
The original was designed by David and Elizabeth Emanuel for Diana and Charles' 1981 wedding.
Emma Corrin will also make her debut as Princess Diana in the fourth season of the Netflix drama.
New footage shows Gillian Anderson as the former PM, as well as a first look at Diana on her wedding day.
The Tenet actor has been tapped to star as the people's princess for the fifth and sixth seasons on the Netflix series.
Spencer will be set over a three-day period when the Princess of Wales realised her marriage to Prince Charles wasn’t working.
"Now they're tearing his wife to pieces," the Gentlemen actor said, referring to the Duchess of Sussex, Meghan Markle.
The Duke and Duchess of Sussex spoke about their trouble with the media spotlight in a new interview.
Kevin Costner Reveals The One Thing That Worried Princess Diana About Starring In The Bodyguard Sequel
The late royal was lined up to star in the follow up to the 1992 box office smash.