Demi Lovato is to serve as the fourth member of the judges' panel on the U.S. version of "The X Factor," MTV.com said.
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Others considered for the job were Avril Lavigne, Janet Jackson and Mariah Carey, MTV.com said.
Paula Abdul and Nicole Scherzinger were fired as judges after the first season of "X Factor" aired and wasn't a ratings winner. Their replacements -- Lovato and Spears -- are expected to be officially announced this week.
"X Factor" is based on a British series by the same name.