In this composite image a comparison has been made between A pregnant Diana, Princess of Wales and pregnant Catherine, Duchess of Cambridge during Trooping the Colour.(Left image) LONDON, ENGLAND - JUNE 12: A pregnant Diana, Princess of Wales with Charles, Prince of Wales, Queen Elizabeth ll and Prince Philip, Duke of Edinburgh on the balcony of Buckingham Palace following the Trooping the Colour ceremony on June 12, 1982 in London, England. (photo by Anwar Hussein/Getty Images)(Right Image) LONDON, ENGLAND - JUNE 15: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on the balcony of Buckingham Palace during the annual Trooping the Colour Ceremony on June 15, 2013 in London, England. (Photo by Chris Jackson/Getty Images)
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Hulton Archive Anwar Hussein