Whether you loved it or hated it, you have to admit: Katy Perry brought on the fun in her CuteCircuit glow-in-the-dark gown at last night's Costume Institute Gala. Little did we know the colors changed from pink to orange to blue to green! She clearly shined some bright lights on the fabulous afterparties. Examine these colors, then tell me — which fluorescent hue is most Fab?
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