Sir Bob first wrote the song 30 years ago to raise money for famine relief but has revived the track to fight ebola.
Bob Geldof wants Carla Bruni to record a version French of the song
Speaking about Carla's contribution, he told the BBC: "The Germans go into bat today, I have asked the Germans to do the German version and I have asked Carla Bruni to do it in France, to translate it into French, so they're going next."
It's thought that Madame Sarkozy will record the single with French acts, including Daft Punk.
Carla became an award-winning singer-songwriter after her international modelling career. While her husband Nicolas Sarkozy was in office, she scaled back her singing commitment to keep the spotlight on his administration. However, the model-turned-musician still has a large following. Her fourth album Little French songs was released in April 2013.
Carla has record four albums
Meanwhile, Sir Bob has said the track, which has had some of the words altered from his 1985 original, raised ₤1million within minutes of being released. On Saturday, he marshalled a starry cast of the most influential names in music for the 2014 version.
Bono, Chris Martin, One Direction, Ed Sheeran, Paloma Faith and Ellie Goulding are just some of the names that took part.