The 41-year-old No Doubt singer said that her trademark look is not a fashion statement, and that she draws inspiration from normal girls on the street.
She told Elle, 'I don't have a favourite brand I switch it up all the time. I change colours too, I was wearing pink lipstick the last day, but I wear red for my husband because he likes the red.
'I get inspiration from everywhere, it could be anything, it could be some hot girl walking along the street, and I go 'I wanna be like her'.'
She continues, 'My style is always evolving, it always has ever since I was a little girl. It's just something that's really organic and natural. I don't put a lot of thought into it in the sense of 'what am I going to do next?' it just kind of happens.
'I have loved playing dress up since a very young age. I'm a typical girl in that I love getting dressed up to go out but when I get there I take a look around and then want to go home. I'm all about getting ready.'