Britain's Queen Elizabeth II attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. / AFP PHOTO / POOL / Geoff Pugh (Photo credit should read GEOFF PUGH/AFP/Getty Images)

Britain's Queen Elizabeth II attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. 

 
 / AFP PHOTO / POOL / Geoff Pugh        (Photo credit should read GEOFF PUGH/AFP/Getty Images)

Queen Mathilde of Belgium (C) laughs during a visit to Centrum Molenmoes in Rotselaar on March 16, 2017. / AFP PHOTO / BELGA / ERIC LALMAND / Belgium OUT (Photo credit should read ERIC LALMAND/AFP/Getty Images)

Queen Mathilde of Belgium (C) laughs during a visit to Centrum Molenmoes in Rotselaar on March 16, 2017. / AFP PHOTO / BELGA / ERIC LALMAND / Belgium OUT        (Photo credit should read ERIC LALMAND/AFP/Getty Images)

MADRID, SPAIN - MARCH 16: Queen Letizia of Spain attends Audiences at Zarzuela Palace on March 16, 2017 in Madrid, Spain. (Photo by Fotonoticias/WireImage)

MADRID, SPAIN - MARCH 16:  Queen Letizia of Spain attends Audiences at Zarzuela Palace on March 16, 2017 in Madrid, Spain.  (Photo by Fotonoticias/WireImage)

COPENHAGEN, DENMARK - MARCH 16: Crown Princess Mary of Denmark (L) poses on the red carpet together with Jaha Dukureh (C) and director for CPH:DOX Tine Fischer at the world premiere of the documentary 'Jaha's Promise' is a documentary with Jaha Dukureh playing herself, about a young woman's fight for her own body and about having the courage to confront her father, politicians and the society at large in order to change the widespread practice of female circumcision (FGM) in Gambia. The documentary is directed and produced by Irish Patrick Farelly and Kate O'Callaghan. (Photo by Ole Jensen - Corbis/Redferns)

COPENHAGEN, DENMARK - MARCH 16: Crown Princess Mary of Denmark (L) poses on the red carpet together with Jaha Dukureh (C) and director for CPH:DOX Tine Fischer at the world premiere of the documentary 'Jaha's Promise' is a documentary with Jaha Dukureh playing herself, about a young woman's fight for her own body and about having the courage to confront her father, politicians and the society at large in order to change the widespread practice of female circumcision (FGM) in Gambia. The documentary is directed and produced by Irish Patrick Farelly and Kate O'Callaghan. (Photo by Ole Jensen - Corbis/Redferns)

LONDON, UNITED KINGDOM - MARCH 16: Britain's Prince Harry chats with US veteran Ivan Castro (C) and UK veteran Karl Hinett (L) who will run the Boston and London Marathons for the Heads Together Campaign, after he attending a conference at King's College on March 16, 2017 in London, England. Prince Harry attended the Veterans' Mental Health Conference where he led a panel discussion with three veterans on the benefits of having open conversations and getting the right support for a range of mental health issues. (Photo by Kirsty Wigglesworth/WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MARCH 16: Britain's Prince Harry chats with US veteran Ivan Castro (C) and UK veteran Karl Hinett (L) who will run the Boston and London Marathons for the Heads Together Campaign, after he attending a conference at King's College on March 16, 2017 in London, England. Prince Harry attended the Veterans' Mental Health Conference where he led a panel discussion with three veterans on the benefits of having open conversations and getting the right support for a range of mental health issues. (Photo by Kirsty Wigglesworth/WPA Pool/Getty Images)