According to the representative, the couple will rearrange their wedding plans later.
Beatrice, 31, ninth in line to the throne, is a granddaughter of the queen and the cousin of princes William and Harry.
She became engaged to property developer Mozzi, 37, in Italy last September.
Unlike her sister Eugenie, who wed wine merchant Jack Brooksbank amid typical royal pomp and pageantry at Windsor Castle in 2018, Beatrice had planned a more low-key event.