Katy Perry performs new single Firework live on X Factor

Tonight, on The X Factor, Katy Perry performed her latest single Firework live. Sadly, the singing left a lot to be desired. Disclaimer: We love Katy Perry here on Shout. We're big fans of her singles and yes, we fancy her quite a bit. But you know where this is going... When Katy took the stage on tonight's X Factor results show, she looked seriously sexy in an all-black catsuit - only Perry could pull off that costume! With a big produc...

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