I haven't, but my wife has. She lived in Austin for a few years and there were always people there either filming or attending film festivals.
George Bush jr(at a fundraiser when he was gov of TX. Laura Bush was there too. It was her fundraiser)
Sandra Bullock(Had drinks with her at a club, chatted for awhile, twice)
Matthew Mcconaughey
Vince Neil and Tommy Lee(in the parking lot at her job. They were staying in the hotel nextdoor. They asked her for directions to some restaurant.)
James Gandolfini(in a hotel lobby)
Peter Jennings(Sat next to him on an airplane)
Russell Crowe(He approached her while she was eating breakfast and asked if he could have her newspaper. She told him he'd have to wait until she was done with it.)
And there's many more that I can't remember. The only celebrities I've met are from Star Trek, at the autograph tables after conventions.
Well, actually, now that I think of it, we saw Eric Benet in a restaurant in New Orleans, but we didn't talk to him. She never initiates conversation with celebrities, anyway. I think they feel comfortable around her because she doesn't freak out and ask for autographs. She's just like, "Oh yeah, there's so-and-so."