...but here goes:

Matt LeBlanc - kinda shared a balcony at the St. Regis Princeville.
Tommy Lee Jones - hotel bar Westin Portland (drank with him and his crew for a few hours).
Robert Deniro - just saw him having a drink in W Montreal (didnt speak to him).
Rodney Dangerfield - pool lounge at some hotel in FLL (could not have been nicer).
Anthony Bourdain - bar waiting area for a resto in Maui. Nice guy with a hot wife.

Aircraft or airline lounge:

Gynneth Paltrow and Cold Play boy (don't know his name), MLL at YYZ.
Barenaked Ladies (all band members) same lounge.
Carol Burnett, Fergie, Courtney Cox, and the black dude from the original Law and Order (who kindly gave up his J seat so me and the missus could sit together), YYZ-LAX flight.

Donovan McNabb YYZ-STL.

Too many NHL players to name.

I know there is more as I used to fly up front YYZ-LAX all the time and would see or speak to folks there.

My coup de gras however is I made a pass (highly unsuccessful I might add) at an Academy Award winner. Helen Hunt.
Was chatting her up at a resto in Santa Monica on Ocean Blvd.
I thought I was getting somewhere, she was chilly was wearing my blazer.
So I lean in for the kiss, absolutely re-buffed!
My co-workers thought it hilarious.
Worse she goes to leave the resto, goes out to valet, and I have to chase after her (she was still wearing my blazer).
The look on her face when I followed her to the valet was priceless.
She was nice when I said all i wanted was the jacket, and got a kiss on the cheek for my effort.
So yes I was shot down in flames but made the effort!