What? A striking, strapless ball gown in hot pink, paired with her signature blonde curls, smoky eye makeup and a matching cerise lip colour for a performance in Selfridges. The disco ball-esque walls and the sparkling microphone added an extra helping of glamour to Katherine's perfect prom queen look.
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Where? Selfridges, London, 11 July
Verdict? Let us know how you rate KJ's latest look in a comment and see more from the singer in her style evolution below:
Hear from Katherine in an interview after singing for the Queen in the video below: