The foreign Royal Guestlist confirmed thus far:
TRH Crown Princess Victoria and Prince Daniel of Sweden
TRH Crown Prince Haakon and Crown Princess Mette Marit of Norway
TRH The Duke and Duchess of Brabant
SAR Los Principes de Asturias
TRH Crown Prince Frederik and Crown Princess Mary of Denmark
TRH The Prince of Wales & The Duchess of Cornwall
TIH Crown Prince Naruhito and Crown Princess Masako of Japan
TRH The Heriditary Grand Duke Guillaume and the Heriditary Grand Duchess Stephanie of Luxembourg
HRH Crown Prince Al Muhtadeh Billah of Brunei
TRH Crown Prince Vajiralongkorn and Princess Sirindhorn of Thailand
Now plus Albert of Monaco, the palace confirmed it