Kara DioGuardi  is following Ellen DeGeneres out of "American Idol," according to reports. TMZ  says "Idol" producers have chosen not to renew DioGuardi's contract and will return to a "three-judge format," with Aerosmith frontman Steven Tyler  reportedly replacing DioGuardi on the panel.
Tyler would be the second new addition after Jennifer Lopez , who sources say has closed a deal to replace DeGeneres  after the talk show host announced her departure  from the show on Thursday.
Randy Jackson, the only remaining original judge on "American Idol," is said to be keeping his job.
DioGuardi, a songwriter and A&R exec who signed Jason Derulo and Iyaz to Warner Bros. Records, was added as a fourth "Idol" judge on season eight.
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