Royal expert Robert Jobson alleges that Katy Perry "caused a stir" among the royal family when she performed at King Charles III's coronation in May 2023. In The Windsor Legacy, which is set to be released next year, Jobson recounted the "star-studded" Coronation Concert that took place the day after Charles' official coronation ceremony. (The king, 77, took the throne immediately following the September 2022 death of his mother, Queen Elizabeth II.) "Lionel Richie lit up the concert with his hit songs 'Easy' and 'All Night Long," his star power undeniable," Jobson wrote in an exclusive excerpt obtained by Us Weekly. "Katy Perry dazzled in a gold gown, belting out her hits 'Roar' and 'Firework' to the delight of 20,000 fans, even getting Princess Charlotte to sing along. The night blended tradition and flair, hosted by Hugh Bonneville, with other major stars like Andrea Bocelli adding to the spectacle." According to Jobson, the alleged drama began when Perry, 41, discovered that Richie, 76, would be receiving special accommodations. King Charles III's Coronation: The Controversies Surrounding the Ceremony "Lionel Richie, a Prince's Trust ally, was invited to stay at Windsor Castle after the show, prompting Katy Perry and her team to demand the same treatment," Jobson claimed. "The palace bigwigs eventually relented, but Perry's entourage caused a stir by partying late into the night, straying into restricted areas." Us Weekly has reached out to the palace and Perry for comment. Before the coronation, Perry said she was thrilled to be performing for the king. King Charles III at his coronation on May 6, 2023. Richard Pohle - WPA Pool/Getty Images "I'm grateful I get to go," she told Entertainment Tonight in April 2023 before explaining her connection to the monarch. "I met His Majesty-to-be a few years ago, and he named me as one of the ambassadors to his organization, The British Asian Trust, which is an organization that helps fight to end child trafficking. I'm also an ambassador for UNICEF, and it really aligned with my values. That's mostly why I'm going, to be an ambassador and to say, 'Hey, this is me from the USA.' No, but it's so cool." During the coronation ceremony on May 6, 2023, Perry went viral after she was caught on camera looking for her seat and seeming to ask for assistance. Days later, she brushed off the jokes. Lionel! The First Lady! Celebs Attend King Charles III's Coronation Service "Well, I just want everybody to know, thank you so much for your concern," she quipped in an interview with Entertainment Tonight. "I found my seat." She added, "You know, the memes are meme-ing and I love it. When you look one way for 15 seconds, it's just all of a sudden, the internet takes over." During a February 2024 Jimmy Kimmel Live! interview, Perry confirmed that she and her mom stayed at Windsor Castle during the coronation. At one point, she and her glam team had a literal run-in with Charles and Queen Camilla while trying to meet up with them for an American Idol segment. "Everyone was running," she recalled, explaining that the group was supposed to take certain prearranged routes through the castle. "I ran straight into them, and I was like, 'Oh, went the wrong way!'"