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Blake Shelton and Gwen Stefani surprise fans with flirty performance

/ Source: TODAY

There's good news for fans who can't get enough of Blake Shelton and Gwen Stefani's romance — the genre-spanning duo can't get enough of each other either.

The country crooner made a surprise appearance during Stefani's concert in Dallas Saturday night, and the two didn't take their eyes off one another as they belted out their relationship-themed hit, "Go Ahead and Break My Heart."

RELATED: Blake Shelton opens up on TODAY Show about his quest to 'impress' Gwen Stefani

While Stefani sang her lines, Shelton smiled and lip-synced along, never breaking their locked gaze or missing a beat.

The flirtation continued throughout the song, and after the final notes, they were in each other's arms.

RELATED: Blake Shelton talks Gwen Stefani: 'All this just has to be meant to happen'

During a recent visit to TODAY, Shelton confessed that he first started writing the single "just to try to impress" his now-girlfriend. But soon he was the one impressed after he sent her his work in-progress.

"Then she writes the next verse, and it's way better," he laughed. "And it's like, 'Whoa! OK.'"

Months later, they still seem to impress each other — and audiences — with every performance.

Follow Ree Hines on Twitter.