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VIENNA, AUSTRIA - APRIL 05: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are greeted by Federal President of the Republic of Austria Alexander Van der Bellen and First Lady Doris Schmidauer as they arrive at Hofburg Palace on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Chris Jackson-Pool/Getty Images)

VIENNA, AUSTRIA - APRIL 05: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are greeted by Federal President of the Republic of Austria Alexander Van der Bellen and First Lady Doris Schmidauer as they arrive at Hofburg Palace on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Chris Jackson-Pool/Getty Images)
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VIENNA, AUSTRIA - APRIL 05: Camilla, Duchess of Cornwall arrives at the Hofburg Palace for a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Chris Jackson-Pool/Getty Images)

VIENNA, AUSTRIA - APRIL 05: Camilla, Duchess of Cornwall arrives at the Hofburg Palace for a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Chris Jackson-Pool/Getty Images)
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VIENNA, AUSTRIA - APRIL 05: Dr. Alexander van der Bellen toasts Camilla, Duchess of Cornwall at the Hofburg Palace during a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Tim Rooke -Pool/Getty Images)

VIENNA, AUSTRIA - APRIL 05: Dr. Alexander van der Bellen toasts Camilla, Duchess of Cornwall at the Hofburg Palace during a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Tim Rooke -Pool/Getty Images)
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VIENNA, AUSTRIA - APRIL 05: Prince Charles, Prince of Wales gives a speech at the Hofburg Palace during a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Tim Rooke -Pool/Getty Images)

VIENNA, AUSTRIA - APRIL 05: Prince Charles, Prince of Wales gives a speech at the Hofburg Palace during a State Dinner on April 5, 2017 in Vienna, Austria. Her Royal Highness will accompany the First Lady on a tour of the presidential apartments whilst His Royal Highness and the President hold a bilateral discussion with the Austrian and British delegations. (Photo by Tim Rooke -Pool/Getty Images)
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