The actress has also embodied a member of this particular royal family before, for the Academy Award-winning 2010 film The King's Speech, in which she played another Elizabeth-Queen Mother of Elizabeth and Margaret.
Series creator Peter Morgan has always said that he meant to replace key cast members in later seasons, to better portray the main characters as they age.
Netflix apparently hasn't given The Crown the green light to start filming another season, but that hasn't stopped its creators from planning it!
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The second season of the drama series from Peter Morgan launched December 8 on the streamer.
Speaking about his decision to recast roles, Morgan said: "You can't ask someone to act middle-aged". The younger sister of Queen Elizabeth II, Princess Margaret has had a tragic arc plagued with heartbreaks and scandals, with her various romances obstructed by the restrictions of royalty and her own sister. The feelings we all have as 50-year-olds are different than the feelings we all have as 30-year-olds. Carter joins Olivia Colman, who will replace Foy, as the first new officially announced castmembers. But the excitement of it so far has been introducing new names, like Foy and Kirby.
Each season of the series has covered a little less than a decade of history; season one spanned eight years, season two spanned seven.
Vanessa Kirby and Matthew Goode as Princess Margaret and Lord Snowden. Kirby told BAZAAR.com she relished playing Margaret's "dark nights of the soul" in Season 2, and we're sure to see more of that from Margaret in coming episodes.