YPRES, BELGIUM - JULY 30: Catherine, Duchess of Cambridge attends the Last Post ceremony at the Commonwealth War Graves Commission Ypres (Menin Gate) Memorial on July 30, 2017 in Ypres, Belgium. The commemorations mark the centenary of Passchendaele - The Third Battle of Ypres. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge attends 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 Karwai Tang/WireImage)
KING'S LYNN, ENGLAND - JULY 05: Catherine, Duchess of Cambridge pushes Princess Charlotte of Cambridge in her pram they leave the Church of St Mary Magdalene on the Sandringham Estate for the Christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
