Gwen Stefani brought Zuma Rossdale along to run errands in Beverly Hills yesterday. She had a one-on-one day with her little guy, but she enjoyed some time alone with Kingston over the weekend. Gwen and Gavin brought their oldest son to visit Gwen's mom on Sunday after they attended a friend's wedding on Saturday. Producer Brad Grey got married, and the Stefani-Rossdales were just one of many famous couples in attendance. Also on hand were Tom Cruise and Katie Holmes, who took a break from celebrating Suri Cruise's fifth birthday for the occasion.