Idol, 67, was originally thought to have one son, 35-year old Willem Wolf, with Perri Lister, as well as daughter Bonnie Blue, 34, from a relationship with Linda Mathis.
He has been famous for almost 50 years but Billy Idol was nearly upstaged by his granddaughter when he received a Hollywood Walk of Fame star last week.
ALISON BOSHOFF: Singer Eva Cassidy - who died in 1996, and would have turned 60 next month - is to be the subject of a new documentary featuring two never-before-heard songs.