Charles and Camilla | Sky News Australia

The royal duo appeared delighted to grace the stage at the M&S Bank Arena in Liverpool, with Camilla donning a chic cobalt blue bespoke Fiona Clare coat for the occasion, while Charles sported a smart suit.

Eurovision director Martin Green started a countdown from ten before the couple pressed a giant button on the darkened stage, which then lit up to reveal the brightly coloured arena. 

The stage design is intended to look as if the contest is “opening its arms to Ukraine”, organisers have said. 

The pair then met an array of presenters and hosts, including Ukrainian host Julia Sanina. 

They also met Blue Peter presenters and were awarded badges in honour of the King’s upcoming coronation. 

Following the big Eurovision unveil, the royal couple headed off to a number of other engagements in the city, including a tour of the Liverpool Central Library to mark the twinning of the library with a Ukrainian public library. 

The much-loved song contest will take place in the UK’s fifth largest city this year, after the country was chosen to host the competition in place of Ukraine. 

Eurovision is generally held in the country which won the preceding year’s event, however the war in Ukraine made it too difficult for the contest to be held in the conflict-ravaged country. 

It will be the first time the competition has been held in the UK for 25 years, and the King threw his support behind the UK’s Eurovision contestant Mae Muller, who also headed to Liverpool for the big unveil. 

Charles told the 25-year-old singer he would be “egging her on” during the competition, with the London-born songstress a hot favourite to take home a sixth Eurovision win for the United Kingdom. 

Eurovision’s grand final is due to take place on May 13, a week after the coronation ceremony, and much of the royal family are expected to head to Liverpool for the big event.