Marie-Chantal, 49, is the Crown Princess of Greece.
She married her husband Pavlos, Crown Prince of Greece, in 1995.
However, the pair will never be king and queen.
This is because in 1974 the Greek people voted for the abolishment of the monarchy in a referendum.
King Constantine and his wife Anne-Marie have been living in France again since 2013.
However, their descendants still carry their titles.
When asked her thoughts on Meghan Markle and Prince Harry’s wedding, the royal offered her advice.
She told Paris Match, a French magazine: “She will have to move away from the world of celebrities, and Hollywood, to quietly join that of other stars: the Royal Family.
“She is lucky to have a modern and sensitive man at her side. Harry will be there to guide her.”
Marie-Chantal was born in London in 1968 to an Eduadorian mother and a British business man.
She was raised in Hong Kong and studied there until she was nine.
Marie-Chantal then went to boarding school in Switzerland, and then onto Paris, and then New York.
Going on to study History of Art in New York, the blonde dropped out of study the year after Pavlos, Crown Prince of Greece, proposed to her.
The royal seems to have inherited her father’s business skills.
She has her own eponymous brand of childrenswear since 2000, of which she is the Founder and Creative Director.
The brand sells high end children’s clothes.
This include baby rompers with ‘angel wings’ on the back for £286 and Cashmere jumpers for children that retail for £205.
Maria-Chantal has 145,000 followers on her Instagram account, which she uses to promote her brand.
Extending her fashion interests, Marie-Chantal is a board director of DFS Group Ltd, a division of LVMH.
LVMH is a luxury goods company that owns the likes of Dior, Fendi, Givency and Louis Vuitton.
Prince Harry was once forced deny he had a romance with Marie-Chantal’s daughter, Maria-Olympia, 21.
The stunning and tall blonde has modelled for Dolce & Gabbana, and is known for her sexy Instagram snaps.