Princess Eugenie has broken her silence with her first Instagram post since missing Trooping the Colour on Saturday. Princesses Beatrice and Eugenie did not appear on the famous Buckingham Palace balcony after many fans were hopeful that the King’s nieces would be present. On Sunday, Princess Eugenie, 34, took to Instagram with her first post since missing the King’s official birthday parade. On her Instagram story, the princess shared a new photograph of her husband Jack Brooksbank and their eldest son, August, three, to mark Father’s Day. The Princess of York captioned the post: “Happy Fathe…