Hallyday is most known for writing music for others, including a collaboration with his father on the 1999 album
Sang pour sang. Hallyday 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. == Personal life ==