Allison Williams stunned when she tied the knot with Ricky Van Veen in Saratoga, WY, on Saturday. The actress wore a beautiful Oscar de la Renta gown for her big day, and her famous dad, Brian Williams, walked her down the aisle. Tom Hanks officiated the ceremony, and his wife, Rita Wilson — who plays Allison's mom on Girls — was also in attendance.
The star-studded guest list included Katy Perry and John Mayer, who held hands during the ceremony, plus Allison's Girls costars Lena Dunham, Zosia Mamet, and Jemima Kirke. Also in attendance were Mindy Kaling, Bruce Springsteen, Diane Von Furstenberg, Seth Meyers, and Andy Cohen. Keep reading to check out stars' arrivals plus pictures of the beautiful ceremony, then see more of the year's most memorable celebrity weddings!