Gwen Stefani and Blake Shelton Are the Cutest Couple Ever in Surprise Dallas Performance

Gwen Stefani and Blake Shelton look more in love than ever.

Gwen Stefani and Blake Shelton are the epitome of #relationshipgoals.

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.

WATCH: Blake Shelton Shares Sweet Backstage Shot from Gwen Stefani's Boston Concert -- 'This Is An Epic Thing to See'

"Dallas one of my favorite shows of the tour THANKU!!!" Stefani, 46, Instagrammed on Sunday. "So blessed."

Earlier this month, 40-year-old Shelton gushed about his superstar girlfriend.

"I still can't believe it. I think that she must have some vision problems," he joked to Late Night host Seth Meyers. "Maybe she needs help."

WATCH: Gwen Stefani Talks Meeting Blake Shelton While in 'the Hell' of Her Life -- 'I Wasn't Trying to Start a Relationship, I Was Just Trying Not to Die'

Meanwhile, Stefani got candid on the start of their romance in a recent interview with Cosmopolitan, admitting that she was hesitant to initially get involved with him.

"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?'"

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