Last night's Vanity Fair Tribeca Film Festival party attracted a fashionable crowd. Designers including Diane von Furstenberg, Tory Burch, and Donna Karan attended the fete, alongside celebrities like Catherine Zeta-Jones, Dakota Fanning, and Helena Christensen. But the standout of the evening definitely goes to Leelee Sobieski, who took a risk in a white, minimalist floor-length gown from Jil Sander's Spring 2012 collection. She emulated the runway look, complementing the V-neck collared dress with a slicked-back hairstyle. This outfit is fit for a modern bride looking to try an off-the-rack find. See Leelee's wedding-worthy gown in today's Fab Flash! On Allison McNamara: Simone jacket, Topshop blouse, H&M earrings.