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The world's youngest billionaire is worth an eye-popping $1.2billion, around £862 million.

Alexandra Andresen comes in as one of the richest people on the planet, after inheriting millions from her business-man father Johan Andresen.

The Andresen family own Ferd, a long-running private investment company.

In 2007, the Norwegian beauty shot to the top spot as the youngest billionaire in the world when her father transferred 42% of the business to Anexandra.

(Image: Instagram)

Her sister Katharina is just one year older, and received the exact same stake in the business.

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Born and raised in Oslo in Norway, this year Alexandra made it onto the Forbes World's Billionaire list.

Alexandra, who recently graduated from high school, is one of Norway's most successful horseback riders, according to Forbes .

(Image: Instagram) (Image: Instagram)

She has won medals at numerous European competitions, and currently lives in Germany, where she is sponsored in dressage by Kingsland.

The teenager's incredible wealth was not widely known until recently, but her family's wealth goes back generations.

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Her great-great-great grandfather bought J.L. Tiedemanns tobacco factory in 1849, which later became the country's market-leading cigarette maker.

(Image: Instagram) (Image: Instagram)

In 2005, the family sold the company for ethical reasons for a huge $500million.

They invested the money wisely in real estate, security and hedge funds, according to The Telegraph.

Older sister Katharina, who is the second youngest billionaire on Forbes's list, is currently a social science freshman at Amsterdam University College in the Netherlands.