Gwen Stefani, Gavin Rossdale Celebrate Son Zuma’s 18th Birthday: Photos

Gwen Stefani is feeling cool about her son’s new chapter. The No Doubt singer celebrated her and ex-husband Gavin Rossdale’s son Zuma officially becoming an adult, ringing in his 18th birthday with a heartfelt video that highlighted the teen’s musical abilities. “I cannot believe u are 18 today!!” Stefani wrote on Instagram Aug. 20. “Watching … The post Gwen Stefani, Gavin Rossdale Celebrate Son…