'American Idol' Guest Judges Are An 'Eye-Opener,' Randy Jackson Says

'They actually know how to critique,' he says of Mary J. Blige, Katy Perry, Avril Lavigne and other celeb judges.By Katie Byrne Randy Jackson Photo: Bennett Raglin/Getty Images Back in August, long before Simon Cowell's departure was the big story surrounding the "American Idol" judges' panel, Paula Abdul announced her exit from the show. The move left producers scrambling to fill her seat for the soon-to-tape auditions, and they rounded up an impressive roster of guest judges for the...

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