The 45-year-old star, who has two other children, Zuma, six, and 16-month-old Apollo, with husband Gavin Rossdale, looks to their nine-year-old for inspiration when it comes to fashion, reported People magazine.
Asked whose style inspires her own wardrobe, she said: "That's a good question! Maybe my oldest son Kingston. He's got really good style -- and he's got good instincts."
The blonde beauty is well known for her edgy ensembles, but insists she is very conservative when it comes to her hair and make-up.
"I have so many red lipstick shades. I really do probably have five that I kind of go in and out of. I mix them a lot. It just depends on what I'm wearing. It's weird because I kind of do the same thing every day, but ... It's always different as well.