David Hallyday (born David Michael Benjamin Smet; 14 August 1966) is a French singer, songwriter and amateur sports car racer.Hallyday was born in Boulogne-Billancourt and is the son of the French singers Johnny Hallyday and Sylvie Vartan. David Hallyday is a first cousin of actor Michael Vartan. He is the older half-brother of actress Laura Smet.Hallyday is most known for writing music for others, including a collaboration with his father on the 1999 album Sang pour sang.He appeared in the teenage comedy He's My Girl (1987), also performing its title theme song. "He's My Girl" reached #79 on the U.S. Billboard Hot 100 and #72 on Cash Box. His 1991 album Rock 'n' Heart spawned a bigger hit, "Ooh La La", which reached #51 on the Hot 100.Hallyday married Estelle Lefébure in 1989; they divorced in 2001. They have two children, Emma and llona. He married Alexandra Pastor, the daughter of businessman Michel Pastor, in 2004. Their son Cameron was born on 8 October 2004.Source: Article "David Hallyday" from Wikipedia in English, licensed under CC-BY-SA 3.0.