Played poker at the Palms (2010 or so?) with Axl Rose. Very small guy who didn't really say much and didn't seem to be a good poker player. Had two security dudes standing with him the entire time. I was more distracted by the fact that Huck Seed (former World Poker Main Event Winner) was also sitting at the table with an absolute mountain of chips.
Played blackjack at the Riviera in Vegas with the Godfather of Soul, James Brown, in the mid-90's. He also had 2 security guys with him who seemed to be in charge of all of his decision making. I'm pretty sure that behind the dark shades, Mr. Brown was completely comatose because he barely moved, and never spoke, the entire time he was at the table.
Played blackjack at the Hard Rock with Rob Zombie. Also a very small dude, but easily recognizable if you were aware of pop culture at all. He was a nice guy and was just hanging out solo.
Best story: Arrived at the Luxor early one morning and as my cab is pulling up to the cab stand, there is a large group of people leaving the casino, somewhat in a hurry. The cabby stops short of the cab stand (thinking the people are going to cross in front of him) and as he does that, half of the group goes in front of the cab while the other half thinks the cab is going to keep moving so they try to go behind it.
The group trying to go behind the cab literally walks right into my door as I'm getting out and I'm face to face ... really, face to face ... maybe 2 feet away ... from Michael Jackson. Absolutely crazy experience. He had been there to see the Titanic Exhibit (I think?) early in the morning before the crowds would see him.