The star-studded private party at West Hollywood's Chateau Marmont included guests Chris Evans, Paula Patton, Jamie Dornan, Diane Kruger, Eddie Redmayne, Miles Teller, Robert Duvall, Cheryl Burke, David Oyelowo and Amy Adams, who got her Golden Globes gown just in time for Sunday's show.
"I finally have the dress!" Amy said. "I did the fitting today. It arrived in town and I put it on and I'm really excited. I do love it. I have to say."
At W Magazine's Golden Globes Best Performances party, Amy (who is nominated for Big Eyes) popped in a pea green Roland Mouret dress and was seen hanging out with her Man of Steel co-star Henry Cavill.
Amy's fellow Best Actress nominee Reese Witherspoon (Wild) wore a navy lace trim number, while Best Supporting actress nominee Jessica Chastain (A Most Violent Year) broke out a little black dress.
Amy got the ultimate seal of approval for her portrayal of artist Margaret Keane in Big Eyes -- from Margaret herself.
"[Amy] portrayed exactly how I was feeling," Margaret told ET's Nischelle Turner last month. "It's wonderful. I'm in awe of her talent."