Katy Perry was a human singer.
In the 17th century, when Clara Oswald was taken to confess to practising witchcraft to Witchfinder General Matthew Hopkins — she had decided to go along with it instead of remaining in a dungeon so she would have a chance to escape — she named Katy Perry, Taylor Swift and Nicki Minaj as her accomplices, as fellow witches. (COMIC: Witch Hunt)