King Charles proved his sense of humour after a playful "Freaky Friday" moment with beloved TV duo Ant McPartlin and Declan Donnelly during a special celebration for The King's Trust.

The official Instagram handle of the British Royal Family posted a video clip of the lighthearted exchange from the celebration earlier this week, marking the charity's 50th anniversary.

The details in the caption read: "Freaky Friday?!"

Adding, "Earlier this week at ‘A King’s Trust Celebration’, The King and Queen traded places with @AntAndDec for a moment on stage to celebrate the charity’s 50th anniversary."

"His Majesty began the charity, as Prince of Wales, in 1976 with the aim of improving the lives of disadvantaged young people in the UK. Since then, The @KingsTrust has supported over 1.3 million young people in the UK – and even more across the world with @KingsTrustInternational," it continued.

Before concluding, "Ant and Dec have supported The Trust for 25 years, partnering with the charity to help the next generation develop skills for the media industry and find jobs and training opportunities."

Throughout the sketch, King Charles and Queen Camilla were seen laughing warmly as the Geordie duo entertained. Dec also referenced the pair's famously similar appearances, joking that with the King and Queen on stage "they know which one's which."