William, George Belt Out 'Sweet Caroline' at Jubilee Concert in Viral Clip

Prince George, 8, and Prince William were seen belting out the words to "Sweet Caroline" in an unguarded moment at the Platinum Party at the Palace, Saturday's concert in honor of the Queen's Platinum Jubilee.

The two princes sat with other members of the royal family throughout the concert, which was put on by Buckingham Palace and the BBC. Rod Stewart, 77, was one of the final performers after a packed lineup that started with Queen and Adam Lambert. While he was covering Neil Diamond's "Sweet Caroline," the princes uncharacteristically danced and sang along.

The @RoyalCentral Twitter account posted the clip and it quickly garnered over 10,000 likes. They captioned the video, "Prince William and Prince George are enjoying Rod Stewart."

"Even better, they're singing a duet," user @EddieFoskew replied. "William stops and George does the bom bom bom bit - that is one hell of a powerful image - I'm feeling a bit overwhelmed by its beauty."

Other viewers were bemused by the unimpressed visage of the woman behind them, with one tweeting, "Who is Mrs Glum behind William.."

The princes were joined in the royal box by William's wife, Catherine, the Duchess of Cambridge, and their daughter, Princess Charlotte, 7. Prince Charles and his wife Camilla were also in attendance, as well as Princesses Beatrice and Eugenie and their husbands.

The Platinum Party at the Palace was held at Buckingham Palace and featured performances by Stewart, Queen, Diana Ross and more. More than 22,000 people attended the palace with countless more gathering in the surrounding area in hopes of overhearing the performances.

The concert coincided with the first birthday of Lilibet Diana Mountbatten-Windsor, daughter of Prince Harry and Meghan, the Duchess of Sussex. Harry, Meghan, Lilibet and their son Archie Mountbatten-Windsor reportedly celebrated her birthday by introducing her to Queen Elizabeth II, for whom she is named, in Windsor.

William, Catherine, George and Charlotte attended an event in Wales during the day, causing TV personality Garcelle Beauvais to quip, "What a coincidence." Embattled brothers William and Harry have not been seen publicly interacting at all during jubilee events, despite both having been in attendance at Trooping the Colour on Thursday and a church service at St. Paul's Cathedral.

The royal family has been participating in jubilee events throughout the four-day Bank Holiday weekend in honor of the queen's 70th year on the throne. Events are wrapping up with pageant on Sunday.