Another star joins the growing roster of American Idol guest jugest – the latest is singer Avril Lavigne, who will fill Paula Abdul’s seat for the Los Angeles auditions. Avril Lavigne joins singer Katy Perry for guest judging duties in LA, where each will spend one day dishes out the critiques.

Avril Lavigne and Katy Perry join previously announced guest judges Victoria Beckham, Mary J. Blige, Neil Patrick Harris, Shania Twain, Kristin Chenoweth and Joe Jonas.