VIDEO : Gwen Stefani Makes Surprise Appearance At Blake Shelton's Los Angeles Show

Gwen Stefani made a surprise appearance at The Forum in Los Angeles on Friday. The 47-year-old singer attended boyfriend Blake Shelton's Doing It to Country Songs Tour, and surprised fans by joining him for an adorable rendition of their duet, "Go Ahead and Break My Heart." Gwen recently posted to Instagram of their moment on stage together. Stefani went full-on glam for the show, wearing a black turtleneck top, shiny patterned mini skirt and thigh-high boots, keeping her platinum blond hair pulled back into a messy bun. The 40-year-old country star was rocking a much more casual look, sporting comfy blue jeans and a gray button-down shirt.