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The TV regular, who is married to rocker Ozzy Osbourne, announced her decision to quit the series earlier this year (12) over a disagreement with TV bosses at NBC, and she hasn't changed her mind as she prepares to say goodbye.
In a series of tweets posted just before taking to the stage for her final appearance on the show's finale on Thursday (13Sep12), she wrote, "@nbcagt is the best variety show in the world. It's been 6 great years, but time to move on... Thank you to the @nbcagt crew, producers, and artists. It was a great honor."
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