14. Salma Hayek and Francois Henri Pinault - 2009
Estimated Cos: $3.5 million
What happens when you marry a billionaire? You have a $3.5 million wedding. They tied the knot at Le Fenice Theatre in Venice, Italy and it was certainly a star-studded affair with guests like Charlize Theron and Penelope Cruz. Food was cooked by famed chef Jose Andres and Bono performed.