Champagne was flowing and the jewels were glowing from Fred Leighton's windows at Fashion's Night Out last evening. The jeweler invited Zac Posen, Lori Goldstein and Tabitha Simmons to each create a window display. While Goldstein's gorgeous psychedelic tableau (above) included a blinking mushroom and mysterious hands popping out of the ground, it was Zac's live model—dressed in a nude body suit embellished with $3 million worth of diamonds and pearls—that was the true traffic-stopper. Suitably accessorized for the occasion himself in a diamond tiara, Zac described the whole thing as an "exoticism happening." And as the designer's sister Alexandra Posen, told us, "It was madness, planning a fashion show and a window display at the same time, so all decisions were made from the heart."