Kelly Bensimon kicked off the Hamptons polo season, throwing the ball to start the third annual Talent Resources Charity Polo Classic Saturday in Water Mill. The reality star was cheered on by three fellow housewives, New York’s Ramona Singer and Countess LuAnn de Lesseps and New Jersey’s Dina Manzo. Polo star Nic Roldan hosted the event and later dined with friends at a private dinner hosted by Kitchit and cooked by “Top Chef” alum Dave Martin, which ended in a playful cupcake fight.