'Girls' Season 3 premiere: Allison Williams parties with dad Brian Williams
Joining the fearless foursome were a handful of new girls guest-starring this season: Danielle Brooks ( "Orange Is the New Black"), Amy Schumer and Gaby Hoffman.
It wasn't all a #GIRLSnight, however. The guys of the cast were well-represented by Alex Karpovsky, Andrew Rannells and Colin Quinn.
But it wasn't just all "Girls" stars, either. Joel McHale, Cristin Milioti and Natasha Lyonne were on hand, as well.
Once inside the party, things got a little weird. Dunham found herself in this lovefest with Rannells and HBO EVP Casey Bloys.
And executive producer Judd Apatow posed on a fake subway train. Because why not?
"Girls" returns for Season 3 on Sunday, Jan. 12 at 10 p.m. on HBO.