Rock ‘n’ roll couple Gavin Rossdale and Gwen Stefani want the world to know about their committment to protecting the environment. The parents of two-year-old Kingston and six-month-old Zuma have revealed their ingenious way to save water washing together. “All families should bathe together,” says Gavin (43). “It’s the least they could do!” . The Bush frontman also endorses recycling and using solar panels.