5) Tatiana Casiraghi (Net worth: $2.2 billion)
Tatiana Casiraghi became a member of Monaco’s royal family after marrying Andrea Casiraghi in 2013. Andrea Casiraghi is second in line to the royal throne. Tatiana was wealthy even before this marriage. She is the granddaughter of Julio Mario Santo Domingo, a rich Columbian businessman and diplomat. He left one-sixth of his fortune to Tatiana.
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