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FILE - In this Sept. 24, 2011 file photo, singer Britney Spears performs on a stage during a concert in Moscow, Russia, during her European tour. A source says she is joining Simon Cowell's singing contest as a judge on the singing competition series "The X-Factor." (AP Photo, file)

FILE - In this Sept. 24, 2011 file photo, singer Britney Spears performs on a stage during a concert in Moscow, Russia, during her European tour. A source says she is joining Simon Cowell's singing contest as a judge on the singing competition series "The X-Factor." (AP Photo, file)

Britney in as 'X Factor' judge

Britney Spears is coming to the rescue of Fox's "The X Factor," the singing contest in search of a ratings boost. The Grammy-winning pop star has signed on as a judge for the show's second season, a person familiar with the deal said Thursday, May 10. (AP)