Splash News Online
Gwen Stefani and her cutie-in-costume, Kingston James McGregor, left a pal’s birthday party on Saturday afternoon in Los Angeles, Calif.
The 4-year-old son of Stefani and husband Gavin Rossdale celebrated his own birthday the week prior, turning four on May 26th.
Also along for the bash? Little brother Zuma, 21 months, not pictured.