For fans who still aren't convinced that Blake Shelton and Gwen Stefani are the real deal, the country crooner helped solidify the couple's relationship status by joining his girlfriend on the opening night of her This Is What the Truth Feels Like tour.

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Before opening night in Boston on July 12, the 40-year-old tweeted, "I'm so happy for y'all!! I'm here watching @gwenstefani rehearsal right now. Prepare yourselves for greatness!!!"

The Voice coach also shared a backstage photo during the mother-of-three's set:

Gwen, 46, was clearly thrilled to have Blake's support, posting a selfie of the duo cuddled up in matching black hoodies.

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#thisiswhatthetruthfeelslike Gx

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And people said this romance wouldn't last! Scroll through the gallery below for more cute photos of the pair!