The No Doubt singer confessed that the main reason she wears such heavy make-up is to please her marital partner of ten years.
She told Harper's Bazaar: "I like to make my husband like me more, and he likes it when I'm wearing make-up."
Stefani added to the interviewer: "I already put my make-up on twice today; I put it on to take my kid to school, and then I went home, washed my face, and put it on again to have lunch with you."
The 42-year-old also said that you would need to "torture yourself" in order to achieve her rock solid abdominals and claims her enviable figure is down to a strict exercise regime.
She joked: "There is no secret - you just have to eat healthy, work out, and torture yourself!"
She has two sons, Kingston, 6, and Zuma, 4, with Bush frontman Rossdale, and she admits that juggling her music career and motherhood is a huge challenge.
She explained: "It's, like, the real deal, dude. It's superfun being a mum, but it's hard too.
"Finding that balance between work and family is the hardest thing I've ever done - by far."
Watch the video for No Doubt's 'Settle Down' below: