Kate, 41, joined her husband Prince William , as well as the King and Queen, in welcoming Yoon Suk Yeol and his wife Kim Keon Hee at the glittering festivities at Buckingham Palace in London.
The Queen, 76, paid tribute to her late mother-in-law as she unearthed Queen Elizabeth s magnificent ruby and diamond Burmese tiara for the event at Buckingham Palace in London.
South Korea s president and his wife were welcomed in London by the Prince and Princess of Wales before the main event - a white tie and tiara ball taking place on Tuesday night.
Prince William and Kate Middleton , who looked stunning in a red outfit, played a key role by greeting the President and the First Lady at their London hotel this morning.