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The hugely anticipated biopic of the late, great Princess premieres in London. See the pictures here...
The film focuses on the final few years of Diana's life and her romance with Andrew's character Dr Hasnat Khan, the man she once referred to as 'Mr Wonderful'.
Stevenson's character Sonia was created from several of the Princesses friends rather than one specific person.
On the red carpet Watts spoke to Heart of the challenges of the role and the fear she felt about playing one of the most famous women of our times.