Stirling's empire isn't confined to YouTube. Her 2014 sophomore album " Shatter Me " hit No. 2 on the Billboard 200 and No. 1 on both the Billboard classical and dance/electronic charts.

At 30 months she went onstage to sing “Jingle Bells” as part of a Christmas program — and, the story goes, had to be forcibly removed by her father after repeating her song seven times.

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