6. Steven Tyler

Steven Tyler’s daughter Liv Tyler is one of the most famous illegitimate children on the planet.

The Aerosmith rocker fathered Liv during a brief relationship with Bebe Buell and according to various reports only found out about the baby years after it was born.

Buell tried to conceal the true identity of her baby’s father to protect her from the rocker’s drug addiction and try and save her relationship with rocker Todd Rundgren whom she had dated at the time.

Liv and Steven seem to have a solid father-daughter relationship despite the rocky beginnings and Steven even got to become a proud granddad as Liv has two children of her own. Steven has three other children with two ex-wives and was certainly living it up back in the day, so he might have more children out there that never came forward.