An article in The Sun claims that, Giselle, 19, put her virginity for sale on the notorious Cinderella Escorts website, which hosts listings from across the world.
The American model says she put her first experience of sex up for sale so she can pay her tuition fees and go travelling.
She said: “I would never have dreamed that the bid would rise so high and we would have reached 2.5 million euros. This is a dream come true.
“I think the trend to sell your virginity is a form of emancipation and I am shocked about people who are against allowing a woman to sell her virginity.
“If I want to spend my first time with someone who is not my first love, that’s my decision.”
The winning bidder is said to be a millionaire businessman from Abu Dhabi.
The teenager added selling her virginity was her idea and she’d only used the website so the transaction and meeting could be carried out safely.
The agency has said she will be accompanied by security to the meeting.
Cinderella Escorts rose to international attention in 2016 when 18-year-old Russian model Allexandra Khefren sold her virginity to a Hong Kong businessman for around £2 million.
It is run by 27-year-old German Jan Zakobielski from his bedroom in Dortmund.
A spokesman for the site said: “On our website you will find a video where girls from all over the world talk about the reasons to sell their virginity. Girls from Australia, Europe, Africa, North and South America. From Arab countries and Asian.
“This shows us that the desire to auction a virginity is no exception.
“And on the other hand, the high bidding for Giselle’s auction shows us how high the demand for virgins is. Business people from all over the world have been bidding.”