This photo, released by Buckingham Palace, displays the invitation to the Coronation of Britain's King Charles III in Westminster Abbey.

King Charles III’s wife has been officially identified as Queen Camilla for the first time, with Buckingham Palace using the title on invitations for the monarch’s May 6 coronation.

Britain's King Charles III and Camilla

The final guest list is yet to be confirmed, but the attendees are certain to include an array of foreign royals, heads of state and politicians.

The US President is set to turn down the King's invitation and could instead send Jill Biden, the first lady, as the White House seeks to counter any perception of a snub.

Humza Yousaf, the new First Minister of Scotland, has said he will be attending – despite having promised to speak at an independence rally in Glasgow later on the same day.

Only a small minority of politicians and peers are expected to be invited and far fewer than the vast numbers that attended Queen Elizabeth II’s coronation in 1953.

While 8,000 guests crammed into Westminster Abbey for the late Queen's investiture, the guest list this year has reportedly been cut to around 2,000.

Prince George is to become the youngest future king to play an official role at a coronation, having been named one of his grandfather’s four Pages of Honour.

Prince and Princess of Wales

It is also likely that since William and his son will be there, his wife, Princess Kate and their other two children Princess Charlotte and Prince Louis will also join.

It has not yet officially announced whether or not Prince Harry and his wife, Meghan, Duchess of Sussex, will attend the Coronation.

Camilla's family is set to get equal billing at the Coronation, with her five teenage grandchildren expected to be thrust into the limelight for the first time with official duties.

Foreign royals and heads of state

The event will also be attended by heads of state from around the world, including from Ireland, France, Spain, Belgium, Japan, Hungary and Monaco.

Members of foreign royal families are also expected to be invited to the ceremony in an historic break with tradition.

Rishi Sunak Prime Minister of the United Kingdom