The Rolling Stones rocker dotes on 23-month-old Rex - his son Jesse's youngest child with wife Fearne Cotton - and the little boy's mother can already see signs of him following in his grandad's footsteps.
Asked if she thinks Rex will be a rocker, Fearne said: ''He definitely takes an interest - it would be hard for him to avoid being passionate about it.
''He's always trying to play the keyboard. We go over to his grandad's house and he's got a big drumkit in the front room. They all have a good bash on it together, which is really cute.''
Fearne - who is also stepmother to Jesse's kids Arthur, 12, and eight-year-old Lola - is renowned for her sense of style and admits it hasn't changed much since she became a parent, though she does tend to favour darker colours more.
She told Now magazine: ''[My style] hasn't changed, not really. I don't wear much white any more because it'll undoubtedly be covered in hand prints and breakfast from Rex. You just have to check yourself before you leave the house to make sure you don't have porridge all down you.''
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