Watch: Blake Shelton and Gwen Stefani Can't Keep Their Eyes off Each Other during Surprise Duet

08/15/2016 12:43 pm EDT

When Gwen Stefani performs, thousands of eyes are glued to her, so it's no surprise that Blake Shelton couldn't keep his eyes off her when he joined her on stage to sing their duet at a Dallas concert.

The pop star's fans didn't seem to mind when her country singer boyfriend made a surprise appearance on Saturday night.

As the two of them sang "Go Ahead and Break My Heart" they gazed at each other. Shelton even lip-synced Stefani's lyrics during her part, as if he was there to serenade only her and not a stadium full of her fans.

This is not the first time the two have heated up the stage with a performance of their first duet together. The touring musicians also try to support each other from the sidelines when they can't share a stage.

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