Avril Lavigne & Katy Perry: American Idol's Latest Judges

Avril Lavigne and Katy Perry will join American Idol as guest judges during the final two days of auditions held this week in Los Angeles.

On their respective days, Avril and Katy will sit at the judges’ table next to Simon Cowell, Randy Jackson and Kara DioGuardi while the final group of singing hopefuls tries for a “Golden Ticket” to Hollywood.

Recently, Victoria Beckham served as a guest judge in Denver and Boston, Mary J. Blige shared her expertise in Atlanta, Joe Jonas and Neil Patrick Harris guest-judged in Dallas, Kristin Chenoweth joined the panel in Orlando and Shania Twain sat at the judges’ table in Chicago.