Sadly my tales are all of Z listers.
I've only met a couple of celebs and they were lovely:
Carol Decker (so nice and chatty)
Cameron Stout (BB4) (I know he's pretty much resoundly hated but when I met him he was so different to how he appeared on Tv. He was handsome, with bags of charisma and so so nice and easy with everyone.)
My Ex used to work with celebs a lot and said the nicest EVER was Jason Donovan. He is a lovely guy who takes time to genuinly talk to people.
He hated (and nosurprises here) Abs (F5ve) and worst of all was Sam Fox who was a rude cow and a diva.