Sarah Fodor and her mother had no idea what was in store for them during a recent Tim McGraw concert in Atlanta.

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ATLANTA -- If you think you're a huge Tim McGraw fan, think again. You clearly haven't met Sarah Fodor.

Sarah can't stop strumming her shiny new guitar. She's written songs. She freestyles. And she isn't afraid to share her talent.

But then again, she's had plenty of inspiration lately: during Tim McGraw's Atlanta concert earlier this month, the country music superstar serenaded Sarah onstage.

"I can't believe that he would choose me!" Sarah told 11Alive's Blayne Alexander.

During an intimate moment in the show, McGraw was seated on the edge of the stage, singing a cover of Joe Cocker's hit "You Are So Beautiful," a tribute to his wife, Faith Hill, and three daughters.

During the song, Barbara Fodor, Sarah's mother, said a fellow audience member asked if he could put Sarah onstage with McGraw. The singer, she says, moved his guitar to make room for Sarah.

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Fodor, along with many others in the audience, quickly pulled out her cell phone and began rolling. In less than a week, the video hit YouTube and went viral, spreading to country music blogs and entertainment websites like wildfire.

But that wasn't all: after finishing the song, McGraw reached for a permanent marker, autographed the guitar and handed it to Sarah.

"I just started crying," Fodor said of the special moment with her daughter. "I didn't even realize he'd given her the guitar or signed it or anything until they handed it to me. I just can't thank him enough."

And if the moment is enough to leave hundreds of thousands of people glued to computer screens, sharing and re-sharing the video, living in the joy of a stranger -- just imagine how Sarah must feel.

Nearly two weeks after the show, she began to cry as she watched the video once more on her mother's cell phone.

"After he played that song, it really touched my heart," she said through tears.

And country music may have just found its next rising star.

"I'm gonna keep it," Sarah said, clutching her autographed guitar. "I'm gonna keep it forever."

GALLERY: Tim McGraw through the years:

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