The wedding included a slew of celebrity guests. Stars included Girls creator Lena Dunham, Katy Perry, John Mayer, Bruce Springsteen, Bee Shaffer, Andy Cohen. Tom Hanks officiated the wedding while his wife Rita Wilson -- who played Williams' mother on the acclaimed HBO comedy -- watched from the audience. Also expected were Seth Meyers and wife Alexi Ashe, Diane von Furstenberg and Williams' co-star Zosia Mamet, who was spotted arriving at the Denver airport with boyfriend Evan Jonigkeit on Friday.
Adding to the star power, Katy Perry performed for the couple while reportedly getting cuddly with John Mayer after the ceremony.