Tatiana Casiraghi – $ 2.4 Billion

Tatiana Santo Domingo-Casiraghi was already wealthy before she joined the Monaco royal family. She has a net worth of $2.4 billion which was given to her by her grandfather, Julio Mario Santo Domingo. He was the founder of Bavaria, a brewery in Columbia which was eventually traded in for a percentage of SABMiller.

After he passed away, Tatiana inherited a sixth of his fortune which made her one of the youngest billionaires in the world. We hope she placed some money in an investment account to increase her net worth, even if she still married a royalty, Andrea Casiraghi.