Gewn Stefani Zuma Kingston Gavin Rossdale Studio City gavinkingstongrandparents.jpg

Only Gwen "I'm vain" Stefani would get this perfectly dressed to take her kids to visit their grandparents.

The No Doubt singer, who admitted she loves to put on makeup for Gavin, wore a full face, with perfect hair and stiletto heels as she toted Zuma, Kingston, Gavin and a nanny to her parents' place in Studio City on Saturday.

Gwen recently revealed that she thinks "it’s unbelievable that we [she and Gavin] have been able to stay together," calling her marriage "one of my biggest achievements." Hmm, from a woman who has an uber-successful music and fashion career, that must mean her marriage has been extremely challenging!

Read what a source told X17online about that ... after the jump.