Royally exhausted! Charles and Camilla enjoy well-earned 'day off' after Coronation

Ryan Seacrest Details King Charles and Queen Camilla's Impromptu 'American Idol' Cameo (Exclusive)

British Invasion! Watch King Charles and Queen Camilla Visit 'American Idol'

King Charles & Queen Camilla Make Surprise Appearance on 'American Idol' After Coronation with Katy Perry & Lionel Richie