The year-old certainly turned heads as she perfectly showed off her supermodel physique in the floor-length number that clung to her curves. Turning around to pose to photographers, Heidi made sure she displayed every inch of her incredible figure as she turned around to show off the backless design. Amping up the glamour, the mother-of-four accessorised with a gold body chain which cascaded between her breasts and wore statement rings on both hands. Opting for a dazzling dress emblazoned with silver sequins, the year-old flashed plenty of flesh as the dress featured slits across her thigh. Joining Martha and Heidi on the backless trend, Lily Aldridge slipped into a blush pink gown which highlighted her statuesque frame. Posing with designer Zac Posen, Heidi appeared in great spirits at the star-studded bash. Play slideshow.