Wearing an above-the-knee, unbelted white dress and black tailored jacket, the supermodel chanteuse turned wife of President Nicolas Sarkozy smiled as she greeted the wives of the world's most powerful leaders for a separate programme devoted to her pet causes of illiteracy and AIDS.
Bruni, 43, and Sarkozy's Elysee Palace have declined to comment on rumours of her pregnancy throughout weeks of frenzied speculation in France, but with no attempt to hide the bump in Deauville, the ending of a state secret eclipsed the absence even of Michelle Obama and Samantha Cameron.
Photographers who knew even before the summit that they would be craning for a view of "le bump" appeared to get a tacit acknowledgement from Bruni as her elegant hands slid maternally around her swelling middle.
At one stage as she posed with four of the wives, Bruni looked down and gestured to her bump with a maternal flourish.
Svetlana Medvedev, wife of the Russian president, presented the expectant mum with a bouquet of flowers.