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The 52-year-old actress will play her Majesty in a new TV drama show.
Emma is the latest to become real acting royalty, following in the footsteps of the likes of Dame Helen Mirren and Dame Judi Dench.
The made-for-TV film, entitled Walking The Dogs, deals with the Buckingham Palace break-in 30 years ago.
Michael Fagan, played by Eddie Marsan, broke in to the Palace, reaching the Queen's bedroom and having a ten minute chat with her Majesty.
Walking The Dogs will be screened on Sky Arts this spring.