The King's coronation is just weeks away, with Buckingham Palace sharing further details about the carriages Charles and the Queen Consort will be travelling in to and from Westminster Abbey on 6 May.
The palace also shared a first look at the beautiful watercolour-designed invitation being sent out to 2,000 guests, which will include members of foreign royal families.
With Prince Albert of Monaco and Japan's Crown Prince Fumihito & Crown Princess Kiko of Japan already confirming their attendance, more senior royals have shared the news that they will be travelling to London next month. See the route that Charles and Camilla will take from Buckingham Palace to Westminster Abbey...
The guestlist now includes King Carl XVI Gustaf of Sweden and his daughter and heir, Crown Princess Victoria.
The Swedish monarch will not be joined by his wife of nearly 47 years, Queen Silvia. Meanwhile, Crown Princess Victoria's husband, Prince Daniel, is expected to also remain in Sweden with the couple's two children, Princess Estelle, 11, and seven-year-old Prince Oscar.
READ: King Charles's coronation: Royal fans concerned following palace update
Denmark's royal court has also confirmed that Crown Prince Frederik and Crown Princess Mary will attend King Charles's and Queen Consort Camilla's coronation at the Abbey.
The couple are not expected to be joined by their four children, Prince Christian, 17, Princess Isabella, 15, and 12-year-old twins, Prince Vincent and Princess Josephine.
SEE: King Charles's coronation crown jewels - your guide to all of the historic regalia
Denmark's monarch, Queen Margrethe, 82, is currently recovering from back surgery that she underwent in February.
The queen is expected to return to royal duties this month, when she makes an appearance at Christian's IX's Palace at Amalienborg on Sunday to mark her 83rd birthday.
While Queen Margrethe will resume her duties, the palace previously said: "The Queen's rehabilitation is going well, but there will still be a number of major tasks that the Queen cannot complete as planned in the coming months. Information is given about this on an ongoing basis."
Spain's royal court also reportedly confirmed to local media on Tuesday that King Felipe and Queen Letizia will also be among the foreign royalty at Charles's coronation.
LISTEN: Want to hear more about the royal family? Check out the best of 'A Right Royal Podcast'
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