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OK, firstly, this question is worded wrong... hello, LJ typo! ;) How amusing!
Now, onto the good stuff, I'll be honest here, my meetings with celebs don't usually end up in me looking like fucking Einstein. John Barrowman for example, no questions were asked, however I did come out with the classic line, "Oh, they can probably just smell my dog!" when his dogs jumped at me. That is pretty much all I said aside from hello, quite embarrassing really, although I'm sure we left quite a lasting impression on him.
Anyway, this has nothing to do with the question, my favourite "super star" would have to be Rupert Grint (of course) and as for what I would ask him/do to him (it's your own fault LJ, it's your own fault), the answer would have to be not much. I'd like to say I'd make the most of it, but I know I wouldn't. I'd ask how he is, if he's having a good day, maybe ask about the ice-cream van, stammer an awful lot and blush ferociously the entire time. Ultimately, it wouldn't matter, getting to see him in the flesh and getting a picture taken with him would be enough for me ♥.
.x.