I had similar experience, but in a different situations.
So, a couple years ago I was working in a hype place. Local artist, indie bands were having gigs there on let's say, weekly basis. I knew that I would meet several 'celebrities' there. I'm a fan of their works.
Apparently, one of the biggest artist was my CEO. I never knew that. I'm a big fan of him. And he was like big, sooo big.
Damn, every meeting feels so awkward because I just can't ignore the fact that I'm a fan. The guy is so humble tho, it helps a lot with my awkward reactions. Thankfully, in the professional manner, my work was considered as good enough. Lol.