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Diva Power Rankings

20. Demi Lovato

After weathering a well-cataloged meltdown, a stronger, wiser Demi Lovato emerged in 2011 with a successful comeback album and a fierce new attitude. This fall, she'll take her career to the next level as a judge on "The X Factor" alongside another diva who knows a thing or two about reinvention: Britney Spears.—Jeff Royer

(Photo: Paul Marotta, Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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