Marie-Chantal, Crown Princess of Greece
Let's just say Marie-Chantal was an American princess long before she married her Greek Prince Charming back in 1995.
As the daughter of billionaire business mogul Robert Warren Miller, who built an expansive empire of duty-free airport shops, Marie-Chantal enjoyed quite the privileged upbringing alongside her two sisters. The socialite trio were the toast of the town in the '90s, so it's hardly a surprise they each married very well. Pia Miller went on to wed oil heir Christopher Getty (grandson of Jean Paul Getty) while Alexandra took on a familiar last name after marrying Prince Alexandre Von Fürstenberg (yes, DVF's son).
While no one would blame her if she decided to sit around eating bonbons all day, even a royal loves the thrill of the hustle. She's the founder and Creative Director of a luxury childrenswear line named after, well, herself. She's also the author of a "modern etiquette book for families." Chic.