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According to Access Hollywood, the actress will join judges Simon Cowell, Randy Jackson and Kara DioGuardi at the Orlando auditions this week.
She is the second Broadway star to join this year's panel, after How I Met Your Mother's Neil Patrick Harris appeared at the Texas auditions on Monday.
Fox has lined up a string of famous faces as temporary replacements for departed judge Paula Abdul, including Victoria Beckham, Joe Jonas and Shania Twain.
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