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From feathers to face paint and excessive headgear, the Met Gala is a chance for stars to express themselves by reaching for their most show-stopping costumes.

But the latest trend to trickle down from the runway to the red carpet is raising eyebrows among fashionistas.

Last night, Salma Hayek surprised onlookers in New York with a flash of electric blue underneath her thigh-split dress, which at first glance looked like a pair of lycra leggings.