United Kingdom, June 24 -- Billy Idol wasn't surprised to discover that he had fathered a child during the 1980s.

The White Wedding rocker found that he was dad to son Brant Broad after his daughter Bonnie - who he has from his relationship with Linda Mathis - discovered her half-sibling through a DNA test and admits that the news wasn't a huge shock due to his hedonistic behaviour at the height of his fame.

In an interview with The i newspaper, Billy said: "Maybe a little bit, but the more I thought about it, I guessed there must be something like that, because we were going around in the 80s, and 70s, just having knockdown, drag-out sex with a million people you didn't know. A lot of people in the rock world got children beyond their ...