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December 22, 2014

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Lady Gaga performs during her “ArtRave: The ArtPop Ball” tour stop at United Center on Friday, July 11, 2014, in Chicago.

Barry Brecheisen / WireImage

Lady Gaga performs during her “ArtRave: The ArtPop Ball” tour stop at United Center on Friday, July 11, 2014, in Chicago.