Crown Prince Hussein of Jordan is 23 years old and currently a student at the Royal Military Academy Sandhurst — and he looks great in uniform!
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Though the Greek royal family doesn't technically exist anymore, Philippos still goes by "Prince," which is really all that matters!
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Wenzeslaus is Prince of Liechtenstein, a principality between Switzerland and Austria with lots of castles. Fun fact: The royal family of Liechtenstein makes up .08 percent of their population. That's almost a full percent!