Ivana Trump introduced her new man, Marc Antonio Rota, to her friends by getting him to serenade her.
The socialite's latest lover stepped out in a white tuxedo, singing an Italian love song for her and other guests at a party held at the Pan Dei Palais in Saint-Tropez.
A source told the New York Post newspaper: "Tongues were wagging that Ivana brought him for all the world to see."
Another source added: "The highlight was Marc Antonio singing to Ivana."
The pair are believed to have been quietly dating since last winter but waited until the lavish party to make their romance public.
The event featured "aquatic entertainment" from synchronized swimmers, impersonators of Whitney Houston and Lady Gaga and a friend of Ivana's also sent a drag queen as a gift to "spice up the evening".
Although Ivana - who has been married four times, most notably to tycoon Donald Trump - is said to be very close to Italian entrepreneur Marc Antonio, they are not thought to be planning on getting engaged anytime soon.
A source said: "They are not engaged, just enjoying their romance."
Since her marriage to Donald, her second union, ended in 1992, Ivana has developed a penchant for Italian men. These include husbands Riccardo Mazzucchelli and Rossano Rubicondi, who she split from in 2008, and boyfriends Count Roffredo Gaetani and Antonio Zequila.
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