United Kingdom, April 25 -- Jo Wood's grandchildren call her "gangster gran".

The 70-year-old model - who raised Jamie, 50, Jesse, 48, Leah, 46, and Tyrone, 41, with ex-husband Ronnie Wood - has been honest with her family about her partying past, and her admission to having taken drugs in her younger years led them to bestow a new nickname on her.

She said on Good Housekeeping UK's 'My Life in a Biscuit Tin' podcast: "They call me Gangster Gran.

"And I was in the car with them - I know I shouldn't say this - they turned around, they were giggling, two of them because I've got 10 [grandchildren], but the two that are very close is Maggie and Kobe.

"And they were giggling, and they went, 'Gran, have you done any drugs?'

"I said, 'Of c...