The Royal Family's most glamorous event of the year complete with tiaras is set to take place tonight. King Charles will host the annual white tie Diplomatic Corps reception at Buckingham Palace later tonight, which sees the royals host 500 diplomats, who all come dressed in all of their finery. The King is set to be joined other members of the Firm including Queen Camilla and Prince William , however it is understood the Princess of Wales , who is often a regular attendee, will not be among