On Friday, Eugenie, 29, posted a throwback photo of her and her sister, 31, as flower girls on Instagram, shortly after Buckingham Palace announced the details of Beatrice and Edoardo Mapelli Mozzi's wedding.
They will be married at the Chapel Royal at St James Palace, with a reception later at Buckingham Palace.
The father of the bride quit public royal duties in November amid an outcry over his friendship with the convicted US sex offender Jeffrey Epstein, who died in August.
Although a princess, she does not carry out official royal engagements but works for Washington-based data and software company Afiniti and divides her time between London and NY.
Bea and Mozzi are set to enjoy a Spring wedding, with the pair apparently tying the knot at a yet to be confirmed location on May 29.
Not only did Harry and Meghan's historic decision to become financially independent and forfeit their HRH titles delay Beatrice's wedding announcement, the ongoing scandal with her dad, Prince Andrew, regarding his friendship with Jeffrey Epstein has stalled her wedding plans.
Beatrice got engaged past year.
But Princess Beatrice will be under no illusion that their father's presence will be an unfortunate focus.
Princess Beatrice and Edoardo Mapelli Mozzi's wedding date confirmation comes only five months after the couple got engaged during a trip to Italy.
Beatrice and Eugenie are respectively ninth and 10th in line to the British throne.
A private reception hosted by Beatrice's grandmother, Queen Elizabeth, will follow Buckingham Palace's gardens.
It will be the fourth royal wedding in two years.
She is not a full-time working royal but works for Afiniti, an artificial intelligence software firm, where she is vice president of partnerships and strategy.
"We are extremely happy to be able to share the news of our recent engagement".
Sources have insisted that it "was always going to be a low-key affair" not least because Mr Mapelli Mozzi, a millionaire property developer, has a young son and was previously engaged to his mother, Dara Huang, a Chinese-American architect from whom he separated in 2018.