Newlywed Allison Williams has shared a magical picture of her wedding dress.

What a dress.

Newlywed Allison Williams, 27, has shared a stunning picture of herself in her Oscar de la Renta wedding gown.

Magic! Allison Williams in her dress. Image via Instagram.

Williams and Ricky Van Veen, 34, were married in Wyoming on Saturday and celebrated with a whole load of famous friends including Williams’ Girls co-stars Lena Dunham, Zosia Mamet and Jemima Kirke.

Also in attendance were Katy Perry and John Mayer who are apparently back together. They held hands and “looked happy”, according to People magazine.

Just married! The Williams-Van Veens.

Tom Hanks officiated the ceremony, according to Page Six, and the bride wore Oscar de la Renta.

Lena Dunham and Jemimi Kirke are ready to party.

Other fancy pants guests included designer Diane von Furstenberg, Rita Wilson, Bruce Springsteen, Andy Cohen, Seth Meyers and Anna Wintour’s daughter Bee Shaffer.

According to our Instagram snooping, Mindy Kaling, Lena Dunham and Jemima Kirke all roadtripped to the wedding in Saratoga. Oh, to be a fly on that car window!

Mindy Kaling and Jemima Kirke en route to the wedding.

Williams and Van Veen have been dating since 2011.

Van Veen is an internet entrepreneur who co-founded the website CollegeHumor.com.