An insider has joined the crew of hardcore French rappers who love to hate President Nicolas Sarkozy: Pierre, the President’s 23-year-old son.

It emerged yesterday that Sarko junior, a hip-hop producer who calls himself Mosey, has written a song for Poison, one of the angriest minstrels from the Paris banlieue ghettos.

Mr Sarkozy, as Interior Minister, ordered the prosecution of half a dozen rappers for insulting the police and became their bête noir with his drive to “clean out the layabouts” from the estates. His creation of a Ministry of National Identity further fired the anti-Sarko ire of the rap world.

When he was running for office, Mr Sarkozy persuaded “Mosey”, the elder of his two blond sons with his Corsican first wife, to stop wearing dreadlocks. But the former law student has persisted in his musical career, creating a label of his own called Crime Chantilly, a play on Crème Chantilly (Whipped Cream). His MySpace internet page description reads: “Hey I’m Mosey a young Parisian producer, with my crew: da Crime Chantilly, we produce hip hop, soul and rnb beatz. Credited on the dvd of Jamel Debouze 100%Debouze. Produced the hiphop track La rue by Poison.”

Poison confirmed in an interview with Radio Générations, a hip-hop station, that Mosey had written the track for his forthcoming album Mec de Tess (guy from the ’hood).

“I’m not a Sarkozy guy, I don’t give a s***,” said Poison, whose name is pronounced the English way. “The guy brought me some music. He does good sh**. I didn’t know at the start that it was the son of Sarko. When I found out, I blew a fuse and phoned him. He said ‘Yeah, but Poison, I didn’t wanna tell you ‘cos you wouldn’t wanna hang out wid me no more’. I told him, hey, no problem. You never done me wrong. We’ll bust nobody’s balls, we’ll just do good stuff.” In an anti-Sarkozy video with other rap singers last year, Poison chanted: “Anti-Sarko, anti-right, Nicolas don’t you hear. We’re anti-you.”

Young Sarko’s only previous reported musical appearance was as an industry guest at the European MTV Awards in Munich last November.

Despite his hip-hop career, the oldest Sarkozy child has tried to avoid publicity unlike to his brother, Jean, 20. He was in court a month ago to face prosecution for failing to stop after his motor scooter collided with a BMW. He combines his university studies with amateur theatre. Both brothers are helping David Martinon, Mr Sarkozy’s spokesman, in his campaign to win the President’s old seat as Mayor of suburban Neuilly in elections in March. While serving as Mr Sarkozy’s aide, Mr Martinon performed regularly with a rock band. He had no comment yesterday on Pierre.

The two older Sarkozy boys grew up in Neuilly, France’s richest borough, at the home of their mother MarieDominique Culioli, a Corsican. Mr Sarkozy divorced Ms Culioli in the early 1990s when he married Cécilia, his last wife — with whom he has one son, Louis, 11. The President, who is a fan of Elvis Presley has a new girlfriend in Carla Bruni, the model who had a hit in 2005 with an album of breathy love songs. The President is under fire for paying too much attention to Ms Bruni. He was due to face a two-hour press conference today amid rumours that the two are to be married next month.

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