Princess Beatrice and her multi-millionaire friend are due to marry within months of contracting at St. James's Palace.
It is said that the daughter of the Duke and the Duchess of York is "in love with the builder Edoardo Mapelli Mozzi" head over heels.
"They are incredibly happy and are already planning the wedding," said a close friend The sunlast night.
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"Edo moved to her apartment at St. James's with Beatrice and spends most of her time there.
"They can barely stand apart and spend every moment they can.
"I do not know if he actually settled down with a ring on one knee, but they talk openly about the marriage and it will either be this year or possibly early 2020.
"I know her parents are thrilled, and the Duchess is already thinking about her wedding day outfit!"
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Last weekend, Edo (35) and Beatrice (30) with their parents Andrew and Sarah attended the Bahrain Grand Prix and were accommodated by the Crown Prince in a luxurious suite at the Ritz Carlton Hotel.
They were recently spotted walking arm in arm in New York.
Beatrice, who has not been dating anyone since her breakup with her 10-year-old boyfriend Dave Clark in 2016, met Edo at her sister Eugenie's wedding last October.
Edo has been a friend of the York family for years. When his stepfather Christopher Shale – a close friend of former Prime Minister David Cameron – died in 2011, Andy, Sarah, Bea and Eugenie went to the funeral.
Bea and Edo began their romance, although he still lived in London with Chinese-American architect Dara Huang and her two-year-old son Christopher "Wolfie" Woolf.
The message Edo saw Bea shake her family and her father Po-Tien, a retired NASA scientist. He said, "Why would you want to end this?
"I can not understand. It's not fair, but the royal family is so powerful.
"What can I do?"
Edo comes from the Italian nobility and is a count whose father Alex was an Olympic skier in the early 70s.
His mother Nicola married Shale, a British businessman and Tory politician. However, he was found dead in 2011 at the Glastonbury Festival in a toilet.
The friend added, "Bea and Edo initially wanted to keep their romance secret because of the situation with his son and the relationship with Dara.
"But now they are just happy that everything is open."
This story was reproduced from The sun with permission.