By SARAH BULL
When it comes to standing out in sexy on-stage outfits, Katy Perry is a pro.
And the 28-year-old singer managed it once again on Sunday night to make a stunning appearance on The X Factor.
Katy wore a corseted tigress outfit as she belted out her hit single Roar, much to the delight of the eager audience and judges Nicole Scherzinger, Sharon Osbourne, Gary Barlow and Louis Walsh.
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