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YPRES, BELGIUM - JULY 30: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Last Post ceremony, which has taken place every night since 1928, at the Commonwealth War Graves Commission Ypres (Menin Gate) Memorial on July 30, 2017 in Ypres, Belgium. The Duke and Duchess of Cambridge are joined by two hundred descendants whose ancestors are named on the Gate, alongside representatives from nations who fought on the Salient. The commemorations mark the centenary of Passchendaele - The Third Battle of Ypres. (Photo by Chris Jackson - Pool/Getty Images)

YPRES, BELGIUM - JULY 30: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the Last Post ceremony, which has taken place every night since 1928, at the Commonwealth War Graves Commission Ypres (Menin Gate) Memorial on July 30, 2017 in Ypres, Belgium. The Duke and Duchess of Cambridge are joined by two hundred descendants whose ancestors are named on the Gate, alongside representatives from nations who fought on the Salient. The commemorations mark the centenary of Passchendaele - The Third Battle of Ypres. (Photo by Chris Jackson - Pool/Getty Images)
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Chris Jackson Collection Chris Jackson

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LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge, Princess Charlotte stand on the balcony during the Trooping the Colour, this year marking the Queen's official 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Samir Hussein/WireImage)

LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge, Princess Charlotte stand on the balcony during the Trooping the Colour, this year marking the Queen's official 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Samir Hussein/WireImage)
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WireImage Samir Hussein

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LONDON, ENGLAND - JUNE 14: Catherine, Duchess of Cambridge during Trooping the Colour at The Royal Horseguards on June 14, 2014 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

LONDON, ENGLAND - JUNE 14: Catherine, Duchess of Cambridge during Trooping the Colour at The Royal Horseguards on June 14, 2014 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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UK Press Mark Cuthbert