Actress Liv Tyler insists the reason she's so level-headed is because her parents, rocker Steven Tyler and model Bebe Buell, were so wild.
The Lord Of The Rings star grew up thinking her surrogate father, musician Todd Rundgren, was her biological dad, until she discovered, aged nine, that that honour fell to Aerosmith wildman Tyler.
And as a result of her parents' former love of partying, Tyler has always been sensible.
She says, "I never had that much to rebel against because my parents were always so kind of cool.
"I mean, what could I do? Run away and smoke a joint and go to rock concerts for the weekend? I mean, that's all they ever did."