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LONDON - MARCH 07: HRH Camilla, Duchess of Cornwall arrives at Buckingham Palace for a State Banquet thrown by HRH Queen Elizabeth II for the President of the Federal Republic of Brazil, His Excellency Mr Luiz Inacio da Silva and his wife Senhora Marisa Leticia Lula da Silva during their State Visit to the UK on March 7, 2006 in London, England. The Brazilian couple are staying at the Brazilian Residence and Buckingham Palace during their stay as guests of The Queen. (Photo by Chris Jackson/Getty Images)

LONDON - MARCH 07:  HRH Camilla, Duchess of Cornwall arrives at Buckingham Palace for a State Banquet thrown by HRH Queen Elizabeth II for the President of the Federal Republic of Brazil, His Excellency Mr Luiz Inacio da Silva and his wife Senhora Marisa Leticia Lula da Silva during their State Visit to the UK on March 7, 2006 in London, England. The Brazilian couple are staying at the Brazilian Residence and Buckingham Palace during their stay as guests of The Queen.  (Photo by Chris Jackson/Getty Images)

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COLOMBO, SRI LANKA - NOVEMBER 15: Camilla, Duchess of Cornwall attends the CHOGM Dinner at the Cinnamon Lakeside Hotel during the Commonwealth Heads of Government 2013 Opening Ceremony at the Lotus Theatre on November 15, 2013 in Colombo, Sri Lanka. The Royal couple are visiting Sri Lanka in order to attend the 2013 Commonwealth Heads of Government Meeting.Prince Charles, representing the Queen will open the meeting. (Photo by Chris Jackson/Getty Images)

COLOMBO, SRI LANKA - NOVEMBER 15:  Camilla, Duchess of Cornwall attends the CHOGM Dinner at the Cinnamon Lakeside Hotel during the Commonwealth Heads of Government 2013 Opening Ceremony at the Lotus Theatre on November 15, 2013 in Colombo, Sri Lanka. The Royal couple are visiting Sri Lanka in order to attend the 2013 Commonwealth Heads of Government Meeting.Prince Charles, representing the Queen will open the meeting.  (Photo by Chris Jackson/Getty Images)

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Camilla, The Duchess of Cornwall smiles as she leaves after the State Opening of Parliament at the Houses of Parliament in London on May 8, 2013. British Prime Minister David Cameron pledged a fresh clampdown on immigration in the Queen's Speech, seeking to bolster his right-wing credentials against the rise of the UK Independence Party (UKIP). AFP PHOTO/POOL/KIRSTY WIGGLESWORTH (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)

Camilla, The Duchess of Cornwall  smiles as she leaves after the State Opening of Parliament at the Houses of Parliament in London on May 8, 2013.  British Prime Minister David Cameron pledged a fresh clampdown on immigration in the Queen's Speech, seeking to bolster his right-wing credentials against the rise of the UK Independence Party (UKIP).  AFP PHOTO/POOL/KIRSTY WIGGLESWORTH        (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)

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LONDON, ENGLAND - JUNE 04: (EDITORS NOTE: Retransmission of #495527905 with alternate crop.) Camilla, Duchess of Cornwall waits for her carriage as she leaves the Palace of Westminster following the Queen's Speech during the State Opening of Parliament in the House of Lords at the Palace of Westminster on June 4, 2014 in London, England. Queen Elizabeth II is to unveil the coalition government's legislative programme in a speech delivered to Members of Parliament and Peers in The House of Lords. Proposed legislation is expected to be introduced on a 5p charge for plastic bags in England, funding of workplace pensions, new state-funded childcare subsidy and reforms to speed up infrastructure projects. (Photo by Alastair Grant - WPA Pool/Getty Images)

LONDON, ENGLAND - JUNE 04:  (EDITORS NOTE: Retransmission of #495527905 with alternate crop.) Camilla, Duchess of Cornwall waits for her carriage as she leaves the Palace of Westminster  following the Queen's Speech during the State Opening of Parliament in the House of Lords at the Palace of Westminster on June 4, 2014 in London, England. Queen Elizabeth II is to unveil the coalition government's legislative programme in a speech delivered to Members of Parliament and Peers in The House of Lords. Proposed legislation is expected to be introduced on a 5p charge for plastic bags in England, funding of workplace pensions, new state-funded childcare subsidy and reforms to speed up infrastructure projects.  (Photo by Alastair Grant - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - JULY 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Camilla, Duchess of Cornwall attends a State Banquet at Buckingham Palace on day 1 of the Spanish State Visit on July 12, 2017 in London, England. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JULY 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Camilla, Duchess of Cornwall attends a State Banquet at Buckingham Palace on day 1 of the Spanish State Visit on July 12, 2017 in London, England.  This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Max Mumby/Indigo/Getty Images)