The Casighiris & The Santo Domingos
Speaking of billionaires marrying into royalty... Over in Monaco there's Andrea Casiraghi and his wife, Tatiana Santo Domingo. He's the eldest son of Princess Caroline of Monaco and thus, the grandson of Grace Kelly and Prince Rainier. Tatiana is the granddaughter of Colombian business magnate, Julio Mario Santo Domingo. Her uncle, Andrés Santo Domingo, is married to our very own New York socialite, Lauren Santo Domingo.