Will I get ID'ed for watching a rated "R" movie?

My friend and I want to see Scream 4 tomorrow and it's rated R. She is 17, but I'm only 16. I already bought the tickets through Fandango.com and on the ticket it says "adult ticket". Basically, there is only one person standing between us and the movie, and it's the guy who scans the tickets. I don't think it would really matter to them, but It would really piss me off if they would ID me. What do you think? Regal Cinemas is who runs the theater, but like I said, I already bypassed the guy who sells tickets..