Kingston Rossdale was in one of his many costumes on Saturday as he headed to a friend's birthday party in LA with his mom, Gwen Stefani, and little brother, Zuma. It was just last weekend that Kingston was the one celebrating his big fourth year with a pricey bash in the company of Gwen's friends like Victoria Beckham and Kate Beckinsale. Gwen continued to stick with baggy clothes, though she recently denied rumors that she's expecting and instead is focused on her mini muscle men, Kingston and Zuma.

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