Sat, 06/15/2024 - 12:31 Tech Insider Kate Middleton joined Prince William and her children on the balcony of Buckingham Palace for the Trooping the Colour flypast.Karwai Tang/Wire Image/Getty Images Tags Entertainment, kate-middleton, trooping-the-colour, royal-family, body-language, royal-body-language, uk-weekend Source Kate Middleton put on a 'game face' in order to 'power through' at King's birth…