Yes, you often see famous people on a cruise ship. I have seen several pro athletes with their families and one or two semi famous people from the entertainment world.
Probably the most interesting was Victoria Gotti. She is an author and tv commentator
but is most famous as the daughter of the "teflon Don", John Gotti. She was travelling with her children and several body guards, Her husband , brother father and uncle were all in jail at the time.