Gwen Stefani had a sunny afternoon out in LA with sons Zuma and Kingston Rossdale yesterday. The little ones linked up with friends at an outdoor birthday party at a park, where Kingston took a turn battering a piñata and Zuma learned how to ride his scooter. Gwen ventured onto a seesaw with Zuma, and also spent time chatting with her father. Gwen is keeping an eye on her little ones while husband Gavin Rossdale is off on tour with Bush. He's shared photos on Twitter of their adventures in South Korea, Indonesia, and Hong Kong. They're due to take the stage next in Kuala Lumpur, Malaysia, and will then go to Australia. With Gavin on tour, Gwen stayed in California and skipped out on attending her L.A.M.B. Fall 2012 show during Fashion Week.