AceShowbiz -

Allison Williams finally tied the knot to longtime boyfriend Ricky Van Veen after delaying the wedding in February. The "Girls" star and her College Humor co-founder boyfriend exchanged vows at a ranch in Wyoming on Saturday, September 19 afternoon.

According to several reports, the bride walked down the aisle in a handmade couture gown made by Oscar de la Renta. Among the reported celebrity guests were Katy Perry, John Mayer, Bruce Springsteen, Seth Meyers, Andy Cohen, Tom Hanks and wife Rita Wilson and Lena Dunham.

A day before the wedding, NY Post's Page Six reported that Diane von Furstenberg and Barry Diller, Zosia Mamet, Jemima Kirke, and Bee Shaffer were also expected to attend. "The wedding is being kept so secret that guests are being asked to fly to Denver, where they will be picked up and taken to the location, which is thought to be somewhere in Wyoming," a source told the publication. "The accommodations for all guests are being paid for and then many of the guests are flying to LA together for Sunday's Emmys."

Williams and Van Veen first met while shooting the pilot for "Girls" and had been engaged since February 2014. She postponed the wedding after her anchorman father Brian Williams got into a scandal involving fabrication of war story.