Rumours of the 31-year-old’s impending nuptials to the multi-millionaire property developer have been circulating since April this year, after The Sun reported that Mozzi had moved into Princess Beatrice’s royal residence at St James’s Palace.
In her post, Princess Eugenie, 29 congratulated the couple, writing that it was “meant to be”.
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“Beabea – wow! I’m so happy for you my dearest big sissy and dear Edo,” she wrote.
“It’s been a long time coming and you two are meant to be.”
Although Princess Beatrice doesn’t have a public Instagram, the ninth in line to the British throne shared a message through her sister’s post, which also featured two photos of her and Mozzi, 35, as well as a close up of her stunning engagement ring.