Gwen Stefani surprised thousands at Country Jam in Colorado by joining Blake Shelton on stage for an unforgettable duet of "Go Ahead and Break My Heart," sending the crowd into a frenzy. Later, she took the spotlight solo, energizing fans with "Hella Good" and a heartfelt birthday celebration for Shelton—complete with a decorated plane and an adorable on-stage kiss. Let’s watch the unforgettable moments unfold in the video!