Prince Harry and Meghan Markle pose for one of two official engagement photos at Frogmore House in December, 2017 in Windsor, United Kingdom. Photo by Alexi Lubomirski via Getty Images.
Prince William and Kate Middleton pose for photographs in the State Apartments of St James Palace on November 16, 2010 in London, England. The couple became engaged during a holiday in Kenya having been together for eight years. Photo by Chris Jackson via Getty Images.
Sophie Rhys-jones And Prince Edward on The Day Of Their Engagement. Photo by Tim Graham via Getty Images.
Prince Charles and Lady Diana Spencer pose outside Buckingham Palace following the official announcement of their engagement. Lady Diana, 19, had been a friend of the Royal Family all her life. Prince Charles, 32, was regarded as one of the world's most eligible bachelors. Photo courtesy of Getty Images.
Prince Andrew with Sarah Ferguson at Buckingham Palace after the announcement of their engagement. Photo by Tim Graham/Getty Images.
Princess Anne and Mark Philips Engagement In London On 1973. Photo by Keystone-France/Gamma-Keystone via Getty Images.
Princess Anne and her fiance, Captain Mark Phillips. Photo by Fox Photos/Getty Images.
Princess Margaret and Antony Armstrong-Jones in the grounds of Royal Lodge after they announced their engagement. Photo by Hulton Archive via Getty Images.
Princess Elizabeth II and Prince Philip, Duke of Edinburgh, at Buckingham Palace shortly before their wedding. Photo by Hulton Archive/Getty Images.
The first official picture after the announcement of the engagement of Princess Elizabeth and Lieutenant Philip Mountbatten, the former Prince Philip of Greece, at Buckingham Palace. Photo by Hulton Archive/Getty Images.