King Charles III isn’t Lionel Richie’s only royal fan!

When the Grammy winner performed as part of the monarch’s coronation concert Sunday, Prince George and Princess Charlotte were spotted dancing in the crowd.

The siblings, who had front row seats in the royal box with parents Prince William and Kate Middleton, waved flags and rocked out to “All Night Long.”

Richie, 73, also sang “Easy (Like Sunday Morning).”

When Katy Perry took the stage, Charlotte was caught on camera singing along to “Roar.”

The “American Idol” judges headlined the show, with the lineup also featuring Nicole Scherzinger, Andrea Bocelli and Take That.

Charlotte wore a Self-Portrait chiffon dress to the outdoor event, later covering up in an Amaia coat.

George, for his part, matched William in a suit and tie.

Follow Page Six’s up-to-date coverage of King Charles III’s coronation

The mini royals’ 5-year-old brother, Prince Louis, did not attend Sunday’s concert after making headlines for yawning his way through the coronation the previous day.

Twitter users praised the little one’s “iconic” behavior at Westminster Abbey on Saturday.

“prince louis yawning and being the most uninterested in this coronation is so funny like he seriously gives 0 f–ks,” one fan wrote, with another adding that his conduct was “very relatable.”

William, 40, joked at a Big Lunch event on Sunday that Charlotte had to make “sure her little brother behaved himself” during the hours-long ceremony, according to Hello! magazine.

“She’s very tired after yesterday,” the Prince of Wales said at Windsor Castle on Sunday. “She’s having a quiet day at home.”