How do I ask this person to be my friend on facebook without sounding creepy?

Question From User - Answers in Comments.

I recently found one of the actors from my favorite musical on facebook. I met him briefly the other day. I realize that hardly qualifies us as friends, but I think he's a really cool, chill person and I really want to add him on facebook. If I sent a message along with the friend request, what would be the best thing to write to convince him to accept my friend request?

Thanks!