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LONDON, ENGLAND - MAY 18: Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard at Clarence House on May 18, 2017 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard  at Clarence House on May 18, 2017 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 18: Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard at Clarence House on May 18, 2017 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard  at Clarence House on May 18, 2017 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 18: Camilla, Duchess of Cornwall, Patron of the London Library, with Zoë Wanamaker, as she hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard at Clarence House on May 18, 2017 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Camilla, Duchess of Cornwall, Patron of the London Library, with Zoë Wanamaker, as she hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard  at Clarence House on May 18, 2017 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)

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LONDON, ENGLAND - MAY 18: Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard at Clarence House on May 18, 2017 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard  at Clarence House on May 18, 2017 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)

see more

LONDON, ENGLAND - MAY 18: Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard at Clarence House on May 18, 2017 in London, England. (Photo by Chris Jackson-WPA Pool/Getty Images)

LONDON, ENGLAND - MAY 18:  Camilla, Duchess of Cornwall, Patron of the London Library, hosts a dinner and evening of readings in honour of the Library's President, Sir Tom Stoppard  at Clarence House on May 18, 2017 in London, England.  (Photo by Chris Jackson-WPA Pool/Getty Images)