son Zuma Gwen Stefani blonde son Zuma Gwen Stefani blonde

With a little bit of help from their nanny, of course!

Gwen Stefani and little Zuma were spotted running errands in Los Angeles yesterday, and the uber fashionable mom and her adorable son did their best to stay cool in the 80-degree weather. Thankfully the temps have dropped from earlier in the week, but Gwen wasn't sweating it -- she even flashed us a sweet smile as she walked back to her car!

Want another peek at Gwen's summer hairstyle? Click after the jump to check it out!