At a recent tour stop in Georgia, Tim McGraw made one lucky little girl's whole world shine by serenading her onstage ... and then giving her his own guitar.

While in Atlanta on July 13, McGraw decided to play a slow song and get a little close with his fans, sitting down with his legs hanging off the stage. That's when one special girl "jumped on stage" (as described by the fan who captured the video) and joined McGraw for something very beautiful and unexpected.

'You Are So Beautiful' "started out as a song for his daughters and Faith," but quickly became about the girl on the stage next to the superstar singer. As McGraw sang, the little girl radiated joy, smiling, swaying and laughing as the crowd cheered. At one point, you can even hear her yell in disbelief, "Oh my God!"

After finishing the song, McGraw is seen reaching over to embrace the girl, even giving her a kiss on the forehead. Then, the crowd went wild when he went a step further -- in the video, McGraw reaches for a Sharpie and begins to sign his acoustic guitar before handing it over to the girl as a souvenir. She begins to cry with happiness as he gives her the gift and walks away.

Talk about a special moment. But Kelly Samford Halcomb, who captured it all on her phone, said it best: "Why I love Tim McGraw and country music."

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