"Okay, then I remember one moment in the VIP booth with a whole bunch of people there having a birthday, and all of a sudden people parted and there was Scarlett [Johansson] really breaking down some moves and seeing the birthday boy go, 'Happy...'
He wasn't Ruffalo'd, but he was Romanoff'd!" Gregg added.
Co-star Tom Hiddleston also detailed the event, highlighting a humorous fitness conversation regarding physique that took place between Evans and Hemsworth at the club.
"There was some dancing involved, but I remember looking back to the only two people in the club who weren't dancing: Messers Evans and Hemsworth.
I heard Chris [Evans] saying, 'But how do you get this [pointing to his shoulder/bicep] to here?'
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And Chris Hemsworth saying, 'I don't know, mate. Like, just work out and stuff,'" Hiddleston said.
