see more

Britain's Queen Elizabeth II (5R) and Britain's Prince Andrew, Duke of York (6R) attend the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017. / AFP PHOTO / POOL / Dominic Lipinski (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

Britain's Queen Elizabeth II (5R) and Britain's Prince Andrew, Duke of York (6R) attend the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017.  / AFP PHOTO / POOL / Dominic Lipinski        (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

see more

Britain's Queen Elizabeth II (R) and Britain's Prince Andrew, Duke of York attend the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017. / AFP PHOTO / POOL / Dominic Lipinski (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

Britain's Queen Elizabeth II (R) and Britain's Prince Andrew, Duke of York attend the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017.  / AFP PHOTO / POOL / Dominic Lipinski        (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

see more

WINDSOR, ENGLAND - APRIL 5: Queen Elizabeth II and Prince Andrew, Duke of York attend a ceremonial presentation of the Guidon to the Royal Lancers at Windsor Castle on April 5, 2017 in Windsor, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)

WINDSOR, ENGLAND - APRIL 5: Queen Elizabeth II and Prince Andrew, Duke of York attend a ceremonial presentation of the Guidon to the Royal Lancers at Windsor Castle on April 5, 2017 in Windsor, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)

see more

Britain's Queen Elizabeth II (3L) meets members of The Royal Lancers during a reception following the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017. / AFP PHOTO / POOL / Dominic Lipinski (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

Britain's Queen Elizabeth II (3L) meets members of The Royal Lancers during a reception following the ceremonial presentation of the Guidon to The Royal Lancers at Windsor Castle, in Berkshire on April 5, 2017.  / AFP PHOTO / POOL / Dominic Lipinski        (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)

see more

WINDSOR, ENGLAND - APRIL 5: Queen Elizabeth II smiles as she meets members of the Royal Lancers during a reception following the ceremonial presentation of the Guidon to the Royal Lancers at Windsor Castle on April 5, 2017 in Windsor, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)

WINDSOR, ENGLAND - APRIL 5: Queen Elizabeth II smiles as she meets members of the Royal Lancers during a reception following the ceremonial presentation of the Guidon to the Royal Lancers at Windsor Castle on April 5, 2017 in Windsor, England. (Photo by Dominic Lipinski-WPA Pool/Getty Images)