Kara DioGuardiAs American Idol gears up for a new series this fall, its roster of judges is expanding its horizons.

Katy Perry and Avril Lavigne will be the latest stars to sit alongside Randy Jackson, Simon Cowell and Paula Abdul’s replacement Kara DioGuardi during the last round of auditions in Los Angeles.

Throughout auditions, the show has welcome Victoria Beckham, Shania Twain, Joe Jonas, Neil Patrick Harris, Mary J. Blige and Kristen Chenoweth to have their say.

Abdul abandoned the show in August in a rather abrupt move that many speculated had to do with salary. But in an interview with the New York Daily News, Abdul said the decision was more about pursuing her career (whatever’s left of it.)

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