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The X Factor winner started off the night

so well style-wise, wearing a floor-length black prom dress  but clearly that wasn't revealing enough for her performance.
Very different looks: Alexandra Burke takes to the stage at the Sony Radio Awards in tight shorts but arrived in a demure prom dress

Very different looks: Alexandra Burke takes to the stage at the Sony Radio Awards in tight shorts but arrived in a demure prom dress  by designer Delada

Instead she teamed the tiny black shorts, which featured buckles at the side, with a leather biker jacket, a Pink Floyd T-shirt and black lace up boots.