The two played Margaret Thatcher and Queen Elizabeth II in the most recent season of The Crown.
She has said her "personal bête noire" wasn't as much of an issue for predecessors Claire Foy and Olivia Colman.
Imelda will be taking over the role of Queen Elizabeth II in the fifth season of the Netflix drama.
The Sex Education star is joining Netflix's royal drama as Margaret Thatcher.
New footage shows Gillian Anderson as the former PM, as well as a first look at Diana on her wedding day.
The streaming service's highlights of the year.
Tobias is set to succeed Matt Smith in the third series of the Emmy-winning Netflix drama.
Fans of the Netflix drama can finally see Olivia Colman and Helena Bonham Carter playing Queen Elizabeth II and Princess Margaret, respectively.
The were almost too many A-listers to count.