The Duke & Duchess Of Cambridge And Prince Harry Join Team Heads Together At A London Marathon Training Day [Getty Images]

LONDON, ENGLAND - FEBRUARY 05: Catherine, Duchess of Cambridge (C), Prince William, Duke of Cambridge (R) and Prince Harry (L) arrive at a Marathon Training Day with Team Heads Together at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Alastair Grant - WPA Pool/Getty Images)

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