Crown Prince Christian of Denmark has sparked speculation about his future after revealing a surprising new passion - the day before his 20th birthday.

The eldest son of Tasmanian-born Queen Mary and King Frederik X took to social media to share photos from his first-ever flight in an F-16 fighter jet at Skrydstrup Air Force Station.

"Today a boy's dream came true," he wrote in Danish, translated by SkyNews.com.au.

"I had the opportunity to get on one of the last training flights in an F-16 aircraft - and wow, it was crazy."

Speaking to Danish outlet Billed Bladet after the flight, the Crown Prince said: "It was incredibly impressive what that plane can do.:

"I am so grateful and honoured to be allowed to fly one last time before the planes are used elsewhere. So thank you very much t

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