Gwen Stefani and Gavin Rossdale took their sons, Kingston and Zuma, out on the town in London today after kicking off their mornings with some exercise. Gwen got in a jog, while Gavin fit in a game of tennis with a friend before the whole family reunited. The foursome have been enjoying some downtime in England for the past week and marked Mother's Day with a visit to a park in the Primrose Hill neighborhood, where they played hide-and-seek and flew kites. After a busy Fall focusing on her latest L.A.M.B. collection, the singer and designer has been taking advantage of a brief break to focus on her kids. The current Elle Women in Music issue cover girl will be back home in LA next month, though, hosting a fund-raising tea party for earthquake relief in Japan.