Kate Middleton was all smiles as she attended the Beating Retreat Ceremony in London on Thursday afternoon. The royal donned a cream coat and nude heels [1] as she stepped out for the military event. The Duchess of Cambridge has certainly been keeping busy this week. In addition to getting all dolled up for the queen's state banquet [2] on Monday, she is set to appear alongside the rest of the royal family for Trooping the Colour [3] on Saturday. In fact, Kate and Prince William's youngest son, Prince Louis, is reportedly making his royal debut [4] at the annual ceremony.