Tong'a King George Tupou V, who is in London for the royal wedding, will travel with other visiting royal families in a procession of luxury coaches to Westminster Abbey for the ceremony.
After the wedding service, 600 of the guests, including the visiting royals, go to Buckingham Palace for the reception.
While he's in London, King George Tupou V, will also have an audience with Prince Charles at Clarence House.
The King's office in Nuku'alofa says following the London visit, he'll travel privately in Europe before returning home.
