Gwen Stefani stripes Kingston Zuma
Gwen Stefani stripes Kingston Zuma

Looking jail house-chic in a black and white striped maxi dress, Gwen Stefani stepped out with her darling boys, Kingston and Zuma, for a friend's birthday party on Saturday afternoon.

The Rossdale boys appeared to be channeling their rocker dad Gavin circa 1990, in ripped flannel shirts, cut off military shorts and wallet chains -- don't mess with these little dudes!

Aside from working on her next children's fashion line for Target, Stefani has been holed up in the recording studio for No Doubt's much-anticipated new album, Tweeting this week: "Singing - send me vibes gx," and, " Still writing!! Wow never ending - love it gx"

We can't wait to hear it!

Gwen Stefani stripes Kingston Zuma