"You will never be alone my love, my heart is your home. Hand in hand, today, tomorrow and forever."
The couple have now married at a private ceremony in Windsor - after their wedding plans were disrupted by the coronavirus pandemic.
So who is Beatrice's new husband?
Known as Edo, the 35-year-old millionaire property tycoon is descended from Italian aristocracy, according to AFP news agency.
He has a young son called Wolfie with Dara Huang, his ex-fiancee, meaning Princess Beatrice is now a stepmother.
Edoardo's father - Alessandro Mapelli Mozzi - is a count and former alpine skier who competed for Great Britain in the 1972 Winter Olympics in Sapporo, Japan.
His mother is Nikki Williams-Ellis, who is married to the sculptor David Williams-Ellis.
She was previously married to Christopher Shale, a senior Tory and close friend of former prime minister David Cameron.
Mr Shale died from heart disease at Glastonbury Festival in 2011.
Mr Mapelli Mozzi is the director of Banda, a property development firm, according to Companies House.
On its website, Banda says its mission is to create "exceptional homes", and Mr Mapelli Mozzi's Instagram feed is filled with photographs of luxurious houses in London and New York which the company has been involved with.
His former flat - which he was selling in 2017 - is equally as stylish.
View this post on Instagram
Mixed emotions on selling my flat. It was this apartment that made me understand "it's not how big the house is, it's how happy the house is" this was the happiest of houses. #bandadesignstudio #smallbutperfectlyformed 📸 credit @simonbrownphotography for @houseandgardenuk
According to his LinkedIn page, Mr Mapelli Mozzi - an alumnus of the University of Edinburgh - had developed more than 400,000 sq ft of London property with an estimated value of £700m by the time he was 30.
He also co-founded the charity Cricket Builds Hope. His stepfather came up with the idea but died before he could take if further.
The organisation coaches people to play cricket in Rwanda "as a tool for positive social change".
Mr Mapelli Mozzi's Twitter account is dominated with discussion about property, but he has previously expressed support for campaigns against plastic pollution in the oceans and whaling in Japan.
Further back, the account has posted messages about gun control in the US, following the Florida school shooting, and also used the hashtag "I'mWithHer" on the night of the 2016 US presidential election.
He also used Twitter to criticise politicians Andrea Leadsom and Jeremy Corbyn.
In 2016, ahead of the London mayoral election, he wrote a piece for Property Week saying there were "simply not enough homes being built" and the future mayor must be more forceful in pushing through redevelopment projects in central London.
Mr Mapelli Mozzi has been a friend of Beatrice's family for some time.
The couple are said to have started a relationship after meeting again at Beatrice's sister Princess Eugenie's wedding to Jack Brooksbank in October 2018.
They had only been seen together in public a handful of times before their engagement.
Mr Mapelli Mozzi designed the engagement ring himself, with the help of British jeweller Shaun Leane.
The large round brilliant cut central solitaire is set on a band of tapered diamond baguettes.
It is not known how much the ring cost, but the non-bespoke rings listed on Mr Leane's website are priced from £5,200 to £16,700.
Their wedding had been planned for 29 May but was rearranged because of coronavirus restrictions.
The couple eventually married at a private ceremony in Windsor on 17 July.
The new date had not been announced in advance and Buckingham Palace said the ceremony, held at The Royal Chapel of All Saints at Royal Lodge, was "small".
It was attended by Beatrice's grandparents, the Queen and the Duke of Edinburgh, along with her parents, the Duke of York and Sarah, Duchess of York, and other close relatives.
The ceremony was originally due to take place at the Chapel Royal, St James Palace, in London.
Plans for a reception hosted by the Queen at Buckingham Palace were cancelled in March.