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Avril Lavigne

Denise Truscello

Other than conflicting reports of pregnancy and hard partying, Avril Lavigne has kept a pretty low profile of late. That's all about to change.

The "Complicated" singer has just joined the fast-lengthening roster of stars filling Paula Abdul's vacant chair on American Idol.

She'll be sitting alongside Simon Cowell, Randy Jackson and Kara DioGuardi, telling prospective Idols she doesn't like their boyfriends singing during one of the final two days of auditions in Los Angeles.

Previously announced seat-filler Katy Perry will be hanging with the A.I. trio on the other day.

This won't be the last you'll hear from Avril this month—she's expected to unveil her latest clothing collection for Abbey Dawn during New York Fashion Week.


Don't miss our American Idol 2010: Guest Judges Galore gallery!