As part of the infamous Primose Hill set in the late nineties and early noughties, the friendship between Kate Moss and Sadie Frost dates back decades and has survived many a raucous night out with the likes of Davinia Taylor and Frost's ex-husband Jude Law.
So it's perhaps no surprise that former fashion designer Frost, 49, is more than ready to gush about one of her oldest friends and hard-partying partner-in-crime.
"Kate has always been herself," Frost tells Grazia of the 40-year-old model, who is godparent to her daughter Iris.
"She’s got an amazing personality and, of course, it’s what she looks like, but it’s also who she is. She just radiates life, lust, sex, everything."
Frost reveals that in the time-honoured tradition of close mates, she often borrows Moss' clothes.
"She doesn’t borrow any of mine, but I borrow hers," the mum-of-four says. "She’s incredibly generous."
Kate and Sadie pictured during the Primose Hill set heyday in 2000
Although she still lives in Primose Hill, Frost claims the days of hedonistic partying are now behind her as she concentrates on her work with Blonde To Black, the production company she set up with friend Emma Comley in 2011.
"I limit myself to one thing a week otherwise I can’t do enough work-wise. And socially, I’ve never felt that comfortable," she says.
The former model, who released her first feature film, Buttercup Bill, in July, says she relishes being behind the camera.
"I’ve done so many things where my career was about what I looked like. Now, it’s about me being in the shadows and being instrumental in what happens."
Sadie and Jude's 17-year-old son Rafferty walked the catwalk for DKNY in June
Frost also has her hands full with her four children - Finlay, 24, from her marriage to Spandau Ballet's Gary Kemp, and Rafferty, 17, Iris, 14 and 12-year-old Rudy, her children with ex-husband Jude Law.
"It’s all down to organisation," she says, of life as a working mum. "I get quite fanatical about what time we leave for the school run. I’m happy most of the time, but sometimes it gets too much."
She reveals she sometimes tussles with her teenage daughter over what to wear. "My daughter Iris is into fashion and has a strong mind about what she likes. I’ve said no a couple of times but it’s difficult when you think about what I wore at her age."
Meanwhile Rafferty already looks set to follow his mum into modelling, after he took to the catwalk for DKNY in June.
"He’s doing his A-levels and is in a band called Dirty Harrys," says Frost. "They’ve got opportunities but you've got to be careful. It can be too distracting. I grew up acting and modelling and you don’t get the education you should."
Photos: Rex Features