Shelton joined the pop star for a rendition of their hit Go Ahead and Break My Heart, and fans went wild as he stepped out to hug his giddy sweetheart.
The loved-up couple looked inseparable onstage as they spent the entire song staring at one other.
Shelton also sweetly mouthed Stefani's part to her while she sang.
"Dallas one of my favorite shows of the tour THANKU!!!" Stefani wrote on Instagram on Sunday (14Aug16). "So blessed."
Earlier this month (Aug16), Shelton gushed about his girlfriend, admitting he was still pinching himself after landing Gwen.
"I still can't believe it," he joked to U.S. TV host Seth Meyers. "I think that she must have some vision problems. Maybe she needs help."