The eldest daughter of Prince Andrew and Sarah Ferguson wore a vintage dress by Norman Hartnell on loan from her grandmother, Queen Elizabeth II.
She also wore the same tiara, the Queen Mary diamond fringe tiara, the queen wore on her wedding day in 1947, according to Buckingham Palace.
The small ceremony was attended by Beatrice's grandparents, Queen Elizabeth and Prince Philip, and "close family," including the couple's parents and siblings. Mapelli Mozzi's son, Wolfie, was both best man and pageboy at the wedding, according to the palace.
None of the photos released of Beatrice and Mozzi on their wedding day included Beatrice's parents.
Her father, Prince Andrew, walked her down the aisle, according to Buckingham Palace. He continues to face intense scrutiny over his relationship with convicted sex offender Jeffrey Epstein, who died in prison from an apparent suicide last year.
Andrew announced last November he would step back from public duties "for the foreseeable future" amid heavy criticism.
Friday's wedding, which Buckingham Palace said "took place in accordance with all relevant Government Guidelines," was a much different affair than was originally planned by Beatrice and Mozzi, who was described by the BBC as a "property tycoon."
The couple, who got engaged last year in Italy, planned to wed on May 29 at the Chapel Royal at St. James's Palace in London, where Prince George, the son of Beatrice's cousin Prince William and his wife, Kate, was baptized in 2013.
A private reception hosted by Queen Elizabeth was to follow the ceremony at Buckingham Palace's gardens.
Beatrice's mom, Ferguson, took to social media on May 29 to mark what would have been her daughter's wedding day.
"Love you my darling Beatrice," Ferguson wrote on Instagram and Twitter, alongside a throwback photo of a young Beatrice. "You have given me more joy than I could ever wish for. I am so excited to celebrate yours and Edo's love when we all are out of lockdown."
"The most important thing is health and love and today I send it to you and all the other people that were getting married during this time .. so proud of you all," she wrote.