Millions across the world have tuned in to watch a pivotal moment in history - King Charles III's Coronation.
The monarch was sworn in as the new king during a monumental ceremony on Saturday that was rooted in tradition and pageantry.
Among 2,000 celebrities and dignitaries filed into Westminster Abbey to witness the celebration - including composer Andrew Lloyd Webber.
But one star guest sat next to the famous West End mogul has puzzled viewers.
The mystery man, who is in fact composer Sir Karl Jenkins, was filmed seated in one of the pews with his signature shaggy white hairstyle and matching moustache, stealing the show.
The Welsh musician, whose Welsh folk song was performed during the ceremony, sported large aviator sunglasses and wore a medal proudly around his neck.
One Twitter user said: "I don't know much about the #Coronation but I do know this is obviously a disguise and 100% they're going to try and steal the crown jewels".
Another jokingly suggested that he was Prince Andrew's ex-wife Sarah Ferguson in disguise, tweeting: "It's Fergie".
One more quipped: "It's Trump".
"Johan Derksen?" another viewer chimed in, suggesting Sir Jenkins was in fact the Dutch sports journalist and former football player.
Fergie reportedly did not receive an invitation from King Charles to be at his extravaganza, despite the former sister-in-law still sharing a home with his brother and seemingly being welcomed back into the royal fold.
It has meant that she wasn't in attendance alongside her daughters Princess Beatrice and Princess Eugenie.
Meanwhile the former president Donald Trump was also banned from the ceremony.
Despite his lack of invitation, he waded in on the debate about Prince Harry being there for his father, saying that he was "very surprised" he would be showing his face as he branded him and his wife Meghan Markle "very disrespectful".
Sir Jenkin's movement - Tros y Garreg, which translates as Crossing the Stone - was played by the coronation orchestra, accompanied by royal harpist Alis Huws.
Alongside the 79-year-old, another guest that distracted Coronation viewers was little Prince Louis.
The five-year-old royal accidentally sang 'God Save The Queen' at the end of the service, leaving royalists in hysterics.
One royal fan tweeted: "Prince Louis sang Queen instead of King bless him #Coronation"
Another wrote: "Prince Louis singing "God Save the Queen" has made my day. He's back!"
The prince attended Westminster Abbey with his parents, the Prince and Princess of Wales, and siblings Prince George and Princess Charlotte.
During the first half of the ceremony, he could also be seen letting out a big yawn, while also taking the opportunity to point out something of interest to his sister Charlotte.
