BUSH frontman Gavin Rossdale and NO DOUBT singer Gwen Stefani have confirmed that theyare heading for divorce after 13 years of marriage. According to TMZ.com, Gwen cites irreconcilable differences in her divorce petition, and is asking for joint custody of the couple’s 3 kids — 9-year-old Kingston, 6-year-old Zuma and 1-year-old Apollo.