Garth Brooks Sings 'The River' Duet With Special Fan

19-year-old Mickey Phernetton was born with Prader-Willi Syndrome, a genetic disorder that leaves her constantly hungry. She has been a lifelong Garth Brooks fan and was excited when she got the chance to meet him at a concert. Mickey was in for an even bigger surprise when Garth pulled out his guitar and the two sang a heartwarming rendition of 'The River.' What a beautiful moment!