These are not major celebrities today, but here goes...
I met Twiggy. She was the godmother of one of the ships owned by the company I worked for. I was invited to a cocktail party she attended aboard the ship and was approached by my boss to say more people needed to talk to her. I had just seen a documentary on her and had heard some funny excerpts, so I asked her about them and we had a good laugh. It was 2010. I think she was 60 at the time and was still beautiful.
I also met Lorna Luft (Liza Minelli's sister) in 2016. She was performing aboard another ship that we introduced. I met her at the gangway. I said, "Oh, you're performing tonight. She said, "No, it's tomorrow night". I didn't argue the point. She WAS performing that night and had just flown from the US to Europe so her voice was shot. I really felt bad for her because her set wasn't good, yet she attended the show the next night like a trooper.
I was on a Star Trek charter aboard a ship in the 80's. I was seated at dinner with Majel Roddenberry, Gene Roddenberry's widow. I couldn't wait to pick her brain about Gene's inspiration for Star Trek. It was fascinating. I also escorted George Takei and his mother to their cabin. He was so gracious, just like he appears when interviewed. I met Nichelle Nicholes, who sang aboard the cruise, as well.
My role in the cruise industry gave me lots of opportunities to meet interesting people and travel to fascinating places, so I feel very fortunate.