Gwen Stefani and Gavin Rossdale pushed Kingston and Zuma along in their matching strollers this morning while at Primrose Hill in London. The foursome explored together for the second day in a row, enjoying the scenic park views and enjoying the Spring weather. Gwen and Gavin missed out on Monday's annual Met Gala, though last year she was among the best dressed in one of her own L.A.M.B. designs. Mother's Day is right around the corner for the Stefani-Rossdale family, and Gavin and the boys have a big feat to pull off if they're going to top the special Sunday brunch they prepared for her last year. Gwen's holding tightly to one of the top positions in your PopSugar 100 — don't forget to fill out your lists for your top moms, dads, vampires, A-list stars, and more!