By Chiara Fiorillo Prince Harry was seen hugging Princess Diana’s siblings at St Paul’s Cathedral earlier this week during a ceremony marking the 10th anniversary of the Invictus Games which was not attended by the Royal Family. The Duke of Sussex smiled when he embraced his mother’s side of the family at the service. A viral clip shows the moment he hugged Diana’s younger brother Earl Spencer, as well as her elder sister, Lady Jane Fellowes. The event was attended by dignitaries, politicians and close friends of Harry, but his father King Charles and brother Prince William were not in attenda…