American Idol auditions are underway and while we've already seen Victoria Beckham step in as a guest judge in two locations, the producers are looking to fill Paula's shoes with a series of female pop stars. Today Joe Simpson shot down rumors that Jessica was angling for a spot, but it got us thinking about some other ladies we'd like to see in the empty seat. Katy Perry is signed up with promises of more to come but tell us — who would you like to see on American Idol?