You can bet it wasn't cheap but then what do you expect when real royalty marries Hollywood 'royalty'? And then they go and invite the entire adult population of Monaco to their celebration. After the prince and his filmstar bride's civil ceremony, a lavish gala was held and all the Monegasque population could attend. In terms of wedding presents, Aristotle Onassis gave the happy couple a 147-foot yacht, while the people of Monaco gave them a cream and black Rolls-Royce convertible.