Beatrice and Edoardo also congratulated the woman of the night, American philosopher Martha C. Nussbaum, who was presented with the coveted Berggruen Prize for Philosophy and Culture.
The couple were spotted "sipping champagne and nibbling on canapés" by the Christmas tree at the New York Public Library, Hello reports.
Beatrice looked stunning in a black maxi dress that had a long hem. The 30-year-old royal cinched her waist with a belt and added a black fringed cape.
Reports claim Edoardo has already met Beatrice's parents - the Duke and Duchess of York.
This is believed to be the royal's first relationship since her split from her partner of ten years, Dave Clark, in 2016.