Princess Beatrice of York, in a secret ceremony, married Italian property developer Edoardo Mapelli Mozzi in Windsor Castle.
According to media reports, Queen, 94, and Duke of Edinburgh, 99, joined Prince Andrew, 60, at the COVID-secure wedding with around 20 guests this morning.
Both of them were due to marry in May but were forced to put plans on hold amid the novel coronavirus outbreak.
With other family members present in the ceremony, however, it is still yet unknown whether her younger sister Princess Eugenie, 30 and brother-in-law Jack Brooksbank were in attendance or not.
Her Majesty was one of the first to leave the party in order to present a knighthood to 100-year-old NHS fundraising hero Capt Tom Moore inside Windsor Castle.
It may be recalled that since July 4 weddings have been allowed for up to 30 people in England.
It is understood Beatrice and Edo had always wanted a relatively small and private wedding.
Count Edoardo Alessandro Mapelli Mozzi is a property developer.
He is the founder and chief executive of Banda, property development and interior design company.