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Meet The World's Royal Teenagers

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16. Alexandre Grimaldi-Coste
Alexandre Grimaldi-Coste is the son of Albert II, Prince of Monaco and the grandson of Grace Kelly. Prince Albert confirmed he was the father of Alexandre in 2005, when he was 21-months-old. At the time, the prince was in a relationship with Alexandre's mother, former Air France flight attendant Nicole Coste, but since they never married, Alexandre doesn't have a lawful claim to the throne. He is currently 17 years old.