"He said, 'Well done.' I imagine it's nice to be a great-granddad, 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." Sir Mick Jagger's pregnant granddaughter Assisi reveals the ageing rocker is excited to welcome a new addition to the family. The 21 year old, daughter of jewellery designer Jade Jagger, is due to give birth next year (14). The baby will make the Rolling Stones icon a great-grandfather for the first time. News of her pregnancy was first reported in September (13).