Assisi, the 21-year-old daughter of Jade Jagger, said giving birth at a young age runs in the family - Jade was just 20 when she was born.
She told Hello! Magazine: “The women in our family just tend to have children young, it runs in the genes.
“I grew up quite quickly and wouldn’t have considered having a child if I was doing what my friends are doing at this stage, messing around. I don’t drink, I don’t smoke and I’m very settled.”
She said she phoned her Rolling Stone grandfather to tell him she was pregnant. “He said, ‘Well done,’ and I said, ‘I didn’t have to try too hard.’ I imagine it’s nice to be a great-grandad - although I’m not sure he likes the idea of getting old, or being called one. I call him Mick - I wouldn’t start calling him grandpa.”
Jade, who will become a grandmother aged just 42, said her daughter will be “a perfect mum”.
She said: “She’s a level-headed, sweet girl and I think it will give them both a lot of pleasure. It gives you an amazing purpose in life, to fulfil nature’s destiny.”