I personally hate doing the whole "are you..." because I always feel imbarassed if I turn out to be wrong. I was in a theatre program last summer that was around the corner from the 7-11 right by Port Authority. I saw Shoshana Bean there and I wasn't sure if it was her at first so I asked. It turned out I was right and she was very nice that I told her that I thought she had an amazing voice.
And, I saw Carey Anderson twice at Saved. One time I was in the student rush line and she came out of the elavator (my guess was that she was doing something in the studio at Playwrights) and the second time was closing night when I was sitting a few seats down from her and her husband. I wanted to say something about how I loved her in Mamma Mia but I didn't because I was to imbarassed to do so. When I was telling people excuse me pardon me etc to get to my seat I slipped in a you were great in Mamma Mia when I passed Anderson. A second later she turned to me and asked me if I thanked her for being in Mamma Mia. I told her I did and she said thank you.
If I was sitting behind her I wouldn't know if I would be able to take my eyes off her because she is so very beautiful.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll