Britain's Camilla, Duchess of Cornwall arrives to attend a Commonwealth Day Service at Westminster Abbey in central London, on March 13, 2017. Queen Elizabeth II has been Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

Britain's Camilla, Duchess of Cornwall arrives to attend a Commonwealth Day Service at Westminster Abbey in central London, on March 13, 2017.
Queen Elizabeth II has been Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / Daniel LEAL-OLIVAS        (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)

LONDON, ENGLAND - MARCH 13: Camilla; Duchess of Cornwall depart from the annual Commonwealth Day service and reception during Commonwealth Day celebrations on March 13, 2017 in London, England. (Photo by Eamonn M. McCormack/Getty Images)

LONDON, ENGLAND - MARCH 13:  Camilla; Duchess of Cornwall depart from the annual Commonwealth Day service and reception during Commonwealth Day celebrations on March 13, 2017 in London, England.  (Photo by Eamonn M. McCormack/Getty Images)

The Prince of Wales and the Duchess of Cornwall speak to choir boys following the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)

The Prince of Wales and the Duchess of Cornwall speak to choir boys following the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)

The Duchess of Cornwall receives flowers from Rebecca Thornton (third right) following the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)

The Duchess of Cornwall receives flowers from Rebecca Thornton (third right) following the Commonwealth Service at Westminster Abbey, London. (Photo by Yui Mok/PA Images via Getty Images)

LONDON, ENGLAND - MARCH 13: Camilla, Duchess of Cornwall arrives for the Commonwealth Service during Commonwealth day celebrations at Westminster Abbey on March 13, 2017 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - MARCH 13:  Camilla, Duchess of Cornwall arrives for the Commonwealth Service during Commonwealth day celebrations at Westminster Abbey on March 13, 2017 in London, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)