The man in question is Nicolas Lefebvre, a French sculptor and former model.
Despite this being their first public appearance as a couple, it is speculated that Bellucci and Lefebvre have been dating for quite some time, even so far back at 2017, according to The Mail.
In November, 2019, Bellucci, 54, spoke to Paris Match, where she hinted at her (at that time, unnamed) boyfriend: "I have been with the same person for some time and everything is fine."
"The man whose life I share does not do the same job as me, but he travels a lot. Her pace of life allows her to understand mine."
Lefebvre is the first man Bellucci has dated publically since her split from husband Vincent Cassel in 2013.
Lefebvre is 37 and lives in Paris. In an interview with The Socialite Family, he noted that he has an eight-year-old daughter named Anahi.