They stopped by Skybar at the Mondrian Los Angeles, where Fassbender ordered a round of beverages for the group, an onlooker tells PEOPLE.
Laughing as the night went on, the crew of actors stayed well past closing, the source adds.
"They were in good spirits having fun!" the source says. "It looked like a very relaxed night out."
The guys' night out comes after James Brolin told PEOPLE that Josh and Lane's split was "mutual" and that "it's all okay."
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