Bruni, whose former high-profile lovers included Eric Clapton, Mick Jagger and Laurent Fabius, the Socialist former French Prime Minister, has spoken about her whirlwind romance with the flamboyant French President whom she met at the home of their friend outside Paris in November 2007.

"There were only eight people and we were seated next to each other and it was instantaneous, immediate... I don't know what he has but he has something very protective that I never found before, may be because I was much more attracted to artists.

"I realised people were shocked when I first started dating, because presidents don't date and I understand that. But it's just another world for me because I come from the modelling and the music -- we can date for ever, we don't have to get married.

"Also it was the first time a president got divorced, usually they don't get divorced because that's not good for their position. So I guess Nicolas is having a life like a normal 50-year-old man: He can get divorced and he can get married again," she says in the film.

The taboo-breaking documentary is also the first to catch Bruni and her husband away from the spotlight – French President bending down to kiss Bruni, who's sitting on a sofa with a guitar in hand, on the neck. "You smell of cigarettes!" she exclaims with a grin.