Michael Schneider Variety Editor at Large Lionel Richie and Katy Perry weren’t able to perform their normal tasks as judges on Sunday night’s “American Idol,” as they were across the pond performing for the coronation of King Charles III. So they brought back a souvenir for the show: The actual just-crowned King and Queen. King Charles III and Queen Camilla were surprise guests on “American Idol,” in a pre-taped package introduced at the start of the show by host Ryan Seacrest. The clip opens with Richie and Perry, in a room that appears to be inside Windsor Castle. Suddenly, in walks the King and Queen. “I just wanted to check, how much, how long you’ll be using this room for?” King Charles quipped to Richie. Charles then thanked Richie for attending and performing at the coronation. “Thank you so much for your brilliant performance and it was great,” he said.