London, Jan 15 - Former supermodel and French First Lady Carla Bruni-Sarkozy has become a step-grandmother to her husband Nicolas Sarkozy's son's first child.

Politician Jean Sarkozy, 23, and his wife Jessica became parents to a baby boy Jan 13 and singer-model Bruni, 42, can boast of being a grandma now, reports express.co.uk

Jean is President Sarkozy's youngest son from his first marriage to Marie-Dominique Culioli.