The couple surprised Stefani's fans during her concert in Dallas, Texas, on Saturday night, when Shelton appeared onstage to sing their hit, "Go Ahead and Break My Heart." Not surprisingly, fans went wild for the duet, although, Stefani and Shelton were clearly lost in their own little world.
In videos posted by concertgoers, the pair adorably can't look away from one another. Shelton also sweetly mouthed Stefani's part to her while she sang.
"We were both having trust issues, as you would if you were us," Stefani revealed, referring to both stars getting divorced at around the same time -- her from Bush frontman Gavin Rossdale, and Shelton from country star Miranda Lambert. "It was like, 'I have so many problems. How can I now be getting into another potentially huge problem? What am I doing?'"