"Coolest guy ever!!! Such a freaking fan… I was so stupid!!!" Spears wrote in the caption.
She and Egerton, 32, appeared to be fast friends as they posed for a photo with their arms around each other. In one clip, he could be seen hugging the Britney Jean artist from behind.
"You gotta get your hands off my wife," Asghari, 28, joked as he turned the camera on himself.