Debicki will take over the role from Emma Corrin, who will star as Princess Diana in the upcoming fourth series due later this autumn.

Jonathan Pryce (Game of Thrones) has also been announced to take over from Tobias Menzies as Prince Philip.

Pryce and Debicki will join the cast confirmed for series five and six including Imelda Staunton (A Confession), who will play Queen Elizabeth, and Lesley Manville (Mum) as Princess Margaret.

The fifth and sixth series of The Crown are expected to cover the 1990s and early 2000s, including Princess Diana’s divorce from Prince Charles and her death in 1997.

Debicki commented on the casting announcement saying, “Princess Diana's spirit, her words and her actions live in the hearts of so many.

“It is my true privilege and honour to be joining this masterful series, which has had me absolutely hooked from episode one."

Pryce, who was recently nominated for an Oscar for his role in Netflix’s The Two Popes, commented: “The positive experience I had making The Two Popes has given me the confidence to tackle the daunting prospect of portraying Prince Philip.

“To be doing so with Peter Morgan and in the company of Imelda and Lesley will be a joy”.

Elizabeth Debicki will play Princess Diana in the final two seasons of The Crown (Seasons 5 and 6). pic.twitter.com/Z3CjHuJ56B

— The Crown (@TheCrownNetflix) August 16, 2020