King and Queen make shock American Idol appearance with Katy Perry and Lionel Richie

ok.co.uk:

American Idol welcomed royalty onto the show on Sunday evening, with King Charles and Queen Camilla making a surprise appearance alongside Katy Perry and Lionel Richie.

Judges Katy, 38, and Lionel, 73, appeared via video link on American Idol as they missed this week's show due to performing at the Coronation Concert in the UK, and chatted to host Ryan Seacrest about the historic celebrations taking place in London.

Lionel, dressed in a black embellished jacket, said: "What a party," before adding: "It was unbelievable." Pop star Katy, who stunned in a green satin gown with an oversized pearl necklace in the clip, added: "It was incredible and we're here for the coronation concert at Windsor Castle." Lionel then teased that he had a "surprise" planned for American Idol.

Charles, 74, and Camilla, 75, suddenly appeared alongside the two musicians, leaving the audience shocked. "Oh goodness," Katy exclaimed, prompting King Charles to joke: "I just wanted to check how long you will be using this room for." Lionel thanked the monarch for coming, with Charles responding: "No, thank you for your brilliant performance and thank Katy as well." He also said it was "great" to have both of the stars there.