Gwen Stefani had a playful Mother's Day weekend with her husband, Gavin Rossdale, and their two sons, Kingston and Zuma, in London. The foursome hit the park yesterday, and she headed out with her littlest one in his stroller earlier today. Gwen was clad in a L.A.M.B. jacket, striped sweater, and harem pants to play a few rounds of hide and seek with Kingston during Sunday's outing at Primrose Hill park. The whole foursome teamed up for a soccer match, and Gavin was also spotted helping Zuma fly a kite on their windy day out. Gwen, who is currently in the running for your favorite celebrity mom in this year's Pop 100, is enjoying the downtime overseas following a lengthy year of recording with No Doubt. Her bandmates are also taking a break to focus on their families, with drummer Adrian Young the latest of the group to announce that he's expecting a child.