Prince George's appearance at the FA Cup final has left royal-watchers all saying the same thing as he was flashed up on screen alongside his dad Prince William.The father and son duo were seen side-by-side at the match between Manchester United and Manchester City at Wembley Stadium in London this afternoon.The Prince of Wales was present in his role as President of the Football Association.The 10-year-old and William, 41, were seen in the stands during the match and shook the hands of all the players after the high-stakes game, which United won 2-1.