Brother Zuma, meanwhile, larked around by posing behind a face board
Gwen – who has already enjoyed success with her LAMB designs – has now teamed up with retail chain Target to make the kids line.
“I”ve always wanted to do a cool children”s fashion line inspired by the super-cute and playful kids” clothing you find in Japan” she said of the venture.
“The whole idea is about being creative, expressing your own individuality and having fun getting dressed.”
As well as her two little leading men, Gwen had the support of her No Doubt band mate Tony Kanal – who was there with his girlfriend Erin Lokitz – and soul singer Robin Thicke.
And fellow Hollywood mum Selma Blair also congratulated her backstage.