Surrounded by 400 friends, and her parents Bill and Hillary (who wore Oscar de la Renta), the former first daughter, 30, wed her longtime boyfriend Marc Mezvinsky, 32, in Rhinebeck, N.Y., Saturday. She wore a dress designed by Vera Wang, a family friend, who was also in attendance. Shortly after the ceremony, President Clinton and Secretary Clinton released a statement. “Today, we watched with great pride and overwhelming emotion as Chelsea and Marc wed in a beautiful ceremony at Astor Courts, surrounded by family and their close friends. We could not have asked for a more perfect day to celebrate the beginning of their life together, and we are so happy to welcome Marc into our family. On behalf of the newlyweds, we want to give special thanks to the people of Rhinebeck for welcoming us and to everyone for their well-wishes on this special day.”