Alessandra Ambrosio dazzled in a white dress at amfAR New York Gala 2017. Alessandra Ambrosio white dress featuring floor length formal evening prom gown, sheath silhouette, one-shoulder neckline and a slit at the skirt. The dress was simple yet elegant. I love this how a strong, feminine silhouette. In this case enhancing the statuesque, stunning figure we see before us.