Gwen Stefani: Party Time with Zuma & Kingston

Gwen Stefani heads to a party with her two sons on Saturday (May 28) in Hollywood, Calif.

The 41-year-old Kingston, 5, walked ahead.

Kingston looked super cute in his white button down and bow tie!

Meanwhile, 45-year-old rocker dad Gavin Rossdale remained close by and filled up the family car with gas.

Also, happy birthday to Kingston! He turned 5-years-old on Thursday (May 26).