The Crown officially casts Helena Bonham Carter as Prince Margaret

TVLine

Carter succeeds Vanessa Kirby as Queen Elizabeth II's sister in Seasons 3 and 4 of the Netflix series. “I’m not sure which I’m more terrified about: Doing justice to the real Princess Margaret or following in the shoes of Vanessa Kirby’s Princess Margaret,” Carter said in a statement. “The only thing I can guarantee is that I’ll be shorter (than Vanessa).” ALSO: The Crown adds Jason Watkins to play former British Prime Minister Harold Wilson.