When you've got it, flaunt it. You'd never think No Doubt frontwoman Gwen Stefani had two kids, with that flat, taut tummy of hers.

But the singer, who spent much of her career wearing micro tops that called plenty of attention to her ripped abs, covers the October issue of Marie Claire. She is looking buff and showing off her street style, including her signature top knot ballerina bun.

This look is a stark contrast to her couture cover of Harper's Bazaar last month. We love seeing two polar opposite sides of our gal Gwen.

And could she be any more naturally beautiful? Few women can mesh platinum blonde with scarlet lips, as is her signature, or pair snakeskin with cargo pants and make it work, but that's just what the 'Hollaback Girl' does in this spread.

We knew she was busy, overwhelmed at being a mom and a musician, and burnt out from her solo career, with nothing left to "talk about" in her lyrics. She's said that many times while promoting 'Push and Shove,' which drops Sept. 25. But she also shared details of what exactly made her so exhausted.

"I would be up all night because my second baby didn't sleep, and he had a lot of ear infections," she recalled about son Zuma, now 4. "Then I'd wake up in the morning and do my workout, which I always felt I had to do, and then meetings for my three clothing lines, and then hang out with my kids, take them to preschool, da-da-da. And then at 4 o'clock, I'd be like, 'All right, I'm out of here, I'm going to go to the studio' and try to write a record. Sit on the couch [with my bandmates] and be like, 'Let's do this now because I'm missing time with the kids; I could be having dinner with them and putting them to bed.' It was really hard."

Watch footage from the Marie Claire cover shoot here.

Marie Claire

Watch the No Doubt 'Settle Down' Video