Givenchy's fall ad campaign—shot by Mert Alas and Marcus Piggott, styled by Carine Roitfeld—is called The Givenchy Rave for a reason. Stella Tennant, Joan Smalls and the other models aren't having seizures; they're dancing, spinning, and kicking their heels up to club music. And right in the best spot, next to the speakers. The proof is in the making-of video. All that's missing are glow sticks and K-holes.