Kelly was slightly dwarfed by Tulisa's giant polka dot dress. Photo: Rex
Never mind the battle of the performances (Tulisa's enormous polka dot 'meringue' as the judges first stepped on to the stage.
Tulisa performed with Little Mix in a fitted LBD. Photo: Rex
Kelly's forest-green embellished high-necked dress was more pared down but no less effective with its stunning plunging neckline and fine details.
Kelly glittered in gold as she performed with Amelia at Wembley. Photo: Rex
Both ladies made a quick change before performing with their own acts and, whileKelly donned the prettiest dress of the night: a shimmering gold minidress.
Which dress do you think rocked Wembley best?
See all the picsfrom The X Factor semi final here: