It was a very good night for the women of Litchfield Penitentiary.  

"Orange Is the New Black" had a lot to celebrate on Sunday evening, after both the show's cast and Uzo Aduba won trophies for their work at the Screen Actors Guild Awards in Los Angeles -- and the stars were ready to party.

The entire cast attended the Weinstein Company & Netflix's joint after-party at Sunset Tower in West Hollywood when the ceremony was over, where they had a blast with their Actor statuettes. 

Danielle Brooks (Taystee) was spotted dancing with Lupita Nyong'o, who looked gorgeous in her crazy colorful Elie Saab gown. Uzo, Natasha Lyonne, Lorraine Toussaint, Taryn Manning, Lauren Lapkus and Barbara Rosenblat were all in festive spirits as well.

Andy Samberg and wife Joanna Newsom also hammed it up at the bash, posing for some adorably awkward photos together with a borrowed statuette ... while the "Boyhood" cast celebrated Patricia Arquette's win at the soiree too, Ellar Coltrane putting his septum piercing back in after the awards wrapped up.

People Magazine and the Entertainment Industry Foundation held their own after-party elsewhere in town, where Zach Galifianakis showed off his Actor (and recent weight loss). Sporting a semi-shaven face, a man bun and a much skinnier frame, the "Hangover" star was almost unrecognizable!

Sofia Vergara and Joe Manganiello continued to look all loved up at the bash as well, where winners like Julianne Moore, Eddie Redmayne, J.K. Simmons, William H. Macy and Viola Davis were all spotted mingling with each other.

Other sightings at that celebration included Claire Danes, Michael Keaton, Ethan Hawke, Maggie Gyllenhaal and Naomi Watts.

Check out the gallery above to see even more partygoers ... and see all the red carpet fashion below!