And Vera Wang outfit - consisting of waist-tie top and completely see-through drawstring skirt.
It's all very 'Russell Brand Who?' And we kind of love her all the more for it. Girl power and all that. If she wants the world to see her undies, then so be it.
Ms Perry performed a frock swap for the evening, attending a Karl Lagerfeld-hosted dinner in this metallic gold Balmain mini dress.
Feast your eyes on more of KP's outlandish style sense in the gallery below:
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