Gwen's new hair 'do. Photo: Splash News

Forty-year-old pop-star turned fashion and fragrance designer, Gwen Stefani, made a sweet escape with her three favorite boys over the weekend -- showing off her new favorite hairdo.

Still rocking the platinum blonde locks, Stefani was sporting a modern shoulder-length bob with husband Gavin Rossdale and their children, Kingston and Zuma, by her side. The choppy, sleek layers replaced Stefani's iconic curls and retro updos we've seen lately -- yet still framed those famous red lips perfectly, creating a soft, yet edgy look for this busy mom.

So what does a Hollywood star wear to the playground and the beach in Malibu with her two kids (and rumors of a third one on the way)? All black, of course!

"Style is just something that comes from within you," Stefani said in a recent interview with InStyle magazine."The funny thing about style is I don't really like to talk about it, I like to just do it. I love designing clothes and I love to wear them. Every opportunity I can, which is pretty much every day of my life, I like to get dressed up. It's just something I've done every since I can remember."

Whatever she wears and whatever she does with her hair, Gwen Stefani proves that she is no-doubt, one hot mama.

Read more about Stefani as she dishes on why she stepped away from music and into the world of fashion. Then, take a look at the "Hollaback" girl's beauty evolution -- she hasn't always been the fashionista she is today!