When you can afford to spend $70m on your wedding and have the celebration last for an entire week instead of the usual single day, you're clearly rolling in money. Vanisha Mittal Bhatia's fortune is so huge that it dwarfs most of the other ladies on our list, standing at $20bn. Her wedding to her businessman husband Amit Bhatia is generally believed to have been the most expensive in history anywhere in the world.
Vanisha's money comes from her father Lakshmi Mittal, who is consistently ranked by Forbes as one of the richest people in the world. Mittal is the chairman of the steel manufacturer ArcelorMittal which takes on projects worldwide and gets well-paid for doing so. The wedding wasn't the only outlandish gift he made to his daughter; he also bought her a $70m mansion in an exclusive area of London.