Fashion photographer Steven Klein opened up his Bridgehampton estate on Saturday evening to host the summer benefit for the AIDS Community Research Initiative of America (Acria), which funds HIV and AIDS-related research, treatment, and education. Sponsored by Calvin Klein Collection and Vanity Fair, the benefit attracted Sarah Jessica Parker and Matthew Broderick, Francisco Costa, Italo Zucchelli, Rachel Zoe, Daphne Guinness, Lauren Santo Domingo, Euan Rellie and Lucy Sykes Rellie, Nacho Figueras, Olivia Chantecaille, Stefano Tonchi, Jane Holzer, and Royal Pains cast members Mark Feuerstein, Jill Flint, Paulo Costanzo and Reshma Shetty, among others. Cityfile correspondent Douglas Marshall took a few mintues to chat with famed artist—and longtime Acria supporter—Ross Bleckner about art, life, and Dash Snow.

The 2009 Mercedes-Benz Polo Challenge held its inaugural match at the Bridgehampton Polo Club on Saturday. Polo heartthrob Nacho Figueras, Chace Crawford, chef Marcus Samuelsson, Kyle MacLachlan and Desiree Gruber, Star Jones and boyfriend Herb Wilson, and a handful of reality TV personalities (Jill Zarin, PC Peterson, Kourtney Kardashian) turned out for the action. Cityfile's roving correspondent Douglas Marshall took a few minutes to catch up with Beth Ostrosky, who turned 37 last week but gets a gold star for still fitting into her short shorts from high school.