I've met a few, some through work and some not,
The nice ones :
Peter Capaldi - lovely, lovely guy who took a genuine interest in a very star struck DH. Says he has family near by to where we stay and was happy to chat for ages. Gave me a big hug and DH was very jealous 
Jimmy Carr- met him through work on a number of occasions and was pleasantly surprised by him. Even more surprised when he remembered me. Very polite.
Simon Cowell- Nice guy.
Paul O' Grady. He was pleasant enough. Smoked a lot! But heard different things about him.
The not so nice :
Shane Filan from Westlife. My teenage crush, met him twice once with Westlife and found him very disappointing.
Mark Owen, this was through work and was at the time he had got caught having affairs so maybe it was to do with that?
The actor that plays Dev in Corrie. He was very drunk and quite aggressive at 5:30 in the morning. I didn't know who he was, a colleague pointed him out.
My ex worked with Prince William and says he was extremely arrogant and up himself but Harry on the other hand was just one of the guys.
Elaine C Smith. Rude and not afraid of the phrase "Do you know who I am?"