The faux pas above all others occurred on the MTV Music Award's red carpet Sunday night. Pink and Shakira showed up in the (gasp!) same Balmain studded leather dress. And they weren't the only ones who looked like twinners: Katy Perry and Kristin Cavallari donned similar, super short silver sequined mini-dresses and model Alessandra Ambrosio matched singer Lykke Li, both wearing identical black, fringe-covered mini-dresses and the season's requisite half bootie shoes.

Taylor Swift stood apart from the look alikes, pulling off a glamorous retro-Hollywood starlet look in a glorious floor-length, one-shouldered sequined gown by Kaufman Franco Resort. Too bad Kayne had to ruin it for her.