A Chinese billionaire is rumoured to have paid £5million for the exclusive services of a Japanese porn star.

In a move which echoes hit 90s film Pretty Woman, the mysterious businessman has hired Rola Misaki as his personal assistant for the next 15 years.

The 22-year-old, who is half-Russian and half-Japanese, recently appeared in Beijing with the man -who was wearing a mask at a public event, the People's Daily Online reports.

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Intimate: Japanese porn star Rola Misaki embraces a man in a mask, believed to be the magnate , at a recent outing in Beijing

Sources claim the disguised tycoon, nicknamed 'Serious Brother,' is famous within the entertainment industry as a big-spending billionaire.

He is said to have secured the star with a 15-year acting contract to help develop her career as well as being his personal assistant.

But the display of affection at the recent event caused many to presume that the contract also includes an 'intimate relations' clause.

Revealing: Rola Misaki's fans will be disappointed her exclusive services have been signed up by a Chinese business tycoon

Mysterious: The tycoon, nicknamed 'Serious Brother' was pictured here with Rola Misaki in Beijing

Pretty: Rola Misaki found fame on Youtube with a serious of revealing photos and videos

Misaki was born in 1992 and due to her cute features quickly found fame on Youtube with a series of revealing videos and photos.

She made her AV debut under the name of Rola Takizawa in 2012 with the Prestige label. With a D-cup chest and slender frame, she never garnered a huge following in Japan, but is loved in China.

Her following on Weibo, the Chinese equivalent of Twitter, is more than 4.8 million.

She has been dubbed Japan's 'National Treasure Beauty' as well as 'Number 1 men's goddess'.

Entertainer: The half Russian, half Japanese entertainer is very popular in China and other parts of the world

Indecent proposal? Rola Misaki is said to have been offered £5million to exclusively work for the mysterious Chinese businessman sporting a mask

Her appointment has not gone down well with her fans with many taking to social media to express their disappointment she is off the market.