But, ironically, the song dedicated to her sister Olivia was one that she had never played before. "When I posted it to YouTube, [Olivia] told me she went to school, [and] everyone said, 'Did you see that song that your sister made for you?' She listened and started crying" (via USA Today). A few weeks later, VanderWaal was actually able to perform it live for her sister ... and millions of fans all around the world.

And while the audience exploded after VanderWaal finished singing, judge Simon Cowell didn't exactly love her performance. In fact, he called VanderWaal's voice "croaky at times," but concluded with, "But that's what makes you perfect" (via YouTube). He continued by saying that the show was about "finding potential," of which VanderWaal has plenty.   

Since her Season 11 AGT win, VanderWaal has definitely kept busy. She released her album, Just the Beginning, in 2017. And in 2020, she starred in the Disney+ film, Stargirl (via People). At this point, the pint-sized singer with a ukulele and a unique voice probably, finally, beautifully knows her name.