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He’s the son of a prince and a former flight attendant

Grimaldi-Coste’s parents met in 1997 while Prince Albert II was on a flight from Nice to Paris. His French-Togolese and former flight attendant mum, Nicole Coste, instantly captivated the young “playboy prince”. Their five-year affair produced a “petit prince” out of wedlock.

Just weeks after his father Prince Rainier III died in 2005, Prince Albert II officially recognised the paternity of the 19-month-old boy. His public announcement came soon after Coste revealed their child’s existence to the French magazine Paris Match. At the time, she claimed that he had not fulfilled his promise to register as the boy’s dad.

He’s not in line to the Monegasque throne

Although he is Prince Albert’s firstborn son, Grimaldi-Coste isn’t Monaco’s heir apparent. Its constitution, which was amended in 2002, states that only “direct and legitimate descendants” can rule the principality – which means the crown will first fall to the two children he had with Princes Charlene, seven-year-old twins Jacques Honoré Rainier and Princess Gabriella, Countess of Carladès.

Still, Grimaldi-Coste has the same inheritance rights to Prince Albert’s billion-dollar fortune as any of his other siblings, making him in line to become very wealthy. While the teenager has no official title and function, he has embraced his Monegasque roots and even made his first official outing at the Monaco Red Cross Ball on July 16.

“It was inappropriate, I was furious to discover that,” Albert told Point de Vue regarding Coste’s comments.

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He bonds with his dad through sports

How do the father and son duo spend some quality time? By playing sports and talking about politics, Coste told Paris Match. A rather cool dad, Prince Albert even threw his teenage son a fun 18th birthday bash this year at Jimmy’z Monte-Carlo, a legendary Monaco club.

“He’s a very nice kid. I must say he has had a really good upbringing. He’s [a] very nice and polite young man and I’m always very happy to see him when I can,” Prince Albert told People.

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He is super close to his siblings

Grimaldi-Coste’s big sister was present at his lavish party last August, and she even shared cute snaps of them on social media. As for his younger half-siblings, Prince Jacques and Princess Gabriella, Grimaldi-Coste reportedly plays with them whenever he sees them.