VIDEO : Gwen Stefani Joins Blake Shelton On His Tour Bus to Celebrates His 40th Birthday

Gwen Stefani / Snapchat Blake Shelton 's 40th birthday was certainly one to remember. In fact, you could call it "Hella Good." The Voice coach and country star's girlfriend, Gwen Stefani , who he has been dating for at least seven months, joined him as he and his band on their tour bus as they headed to the Country Jam 2016 festival in Grand Junction, Colorado, where Shelton performed as a headliner. The 46-year-old pop and ska singer also shared the stage with him.