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LONDON, ENGLAND - JUNE 17: Queen Elizabeth II and Prince Philip, Duke of Edinburgh leave Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England. (Photo by James Devaney/WireImage)

LONDON, ENGLAND - JUNE 17:  Queen Elizabeth II and Prince Philip, Duke of Edinburgh leave Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England.  (Photo by James Devaney/WireImage)

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LONDON, ENGLAND - JUNE 17: Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge and Autumn Phillips stand on the balcony of Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England. (Photo by James Devaney/WireImage)

LONDON, ENGLAND - JUNE 17:  Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge and Autumn Phillips stand on the balcony of Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England.  (Photo by James Devaney/WireImage)

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LONDON, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge stand on the balcony of Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England. (Photo by James Devaney/WireImage)

LONDON, ENGLAND - JUNE 17:  Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George of Cambridge and Prince William, Duke of Cambridge stand on the balcony of Buckingham Palace during the Trooping the Colour parade on June 17, 2017 in London, England.  (Photo by James Devaney/WireImage)

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LONDON, UNITED KINGDOM - JUNE 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Princess Charlotte of Cambridge, Prince George of Cambridge, Savannah Phillips and Isla Phillips watch the flypast from the balcony of Buckingham Palace during the annual Trooping the Colour Parade on June 17, 2017 in London, England. Trooping the Colour is a military parade to mark Queen Elizabeth II's official birthday 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 Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Princess Charlotte of Cambridge, Prince George of Cambridge, Savannah Phillips and Isla Phillips watch the flypast from the balcony of Buckingham Palace during the annual Trooping the Colour Parade on June 17, 2017 in London, England. Trooping the Colour is a military parade to mark Queen Elizabeth II's official birthday 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 Max Mumby/Indigo/Getty Images)

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LONDON, UNITED KINGDOM - JUNE 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince George of Cambridge and Princess Charlotte of Cambridge watch from a window of Buckingham Palace during the annual Trooping the Colour Parade on June 17, 2017 in London, England. Trooping the Colour is a military parade to mark Queen Elizabeth II's official birthday 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 Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 17: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince George of Cambridge and Princess Charlotte of Cambridge watch from a window of Buckingham Palace during the annual Trooping the Colour Parade on June 17, 2017 in London, England. Trooping the Colour is a military parade to mark Queen Elizabeth II's official birthday 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 Max Mumby/Indigo/Getty Images)