PARTIESPhotos: Having a Tribeca BallVan Cleef & Arpels toasts young artists at Tribeca Ballby Gillian Sagansky04.14.151Mary-Kate Olsen and Olivier Sarkozy. Photo by BFAnyc.com.2Brooke Shields. Photo by BFAnyc.com.3Calvin Klein and Peter Marino. Photo by BFAnyc.com.4Parker Posey. Photo by BFAnyc.com.5Alexander Gilkes and Dustin Yellin. Photo by BFAnyc.com.6Peter Brant, Stephanie Seymour, and Harry Brant. Photo by Patrick McMullan.7Misha Noonoo. Photo by BFAnyc.com.8Robert De Niro and Kenny Scharf9Beatrix Ost. Photo by Patrick McMullan.10Eileen Guggenheim and David Kratz. Photo by Patrick McMullan.