Watch Shawn Mendes Perform 'Stitches' Live: Billboard Exclusive

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Shawn Mendes performs on stage at We Day UK at Wembley Arena on March 5, 2015 in London, United Kingdom.

Shawn Mendes, the 16-year-old Vine star-turned-hitmaker, is in the middle of touring arenas around the country in support of his No. 1 album Handwritten. His show at Connecticut's Mohegan Sun Arena on June 7 marked a huge milestone: his first sold-out arena. To commemorate the occasion, Mendes shared footage of his performance of "Stitches" that night exclusively with Billboard.

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“Performing ‘Stitches' and all of the songs from Handwritten at my first ever sold-out arena show was so crazy," Mendes tells Billboard. "Just hearing the entire crowd sing along to every word is a feeling I can't even explain.”

Watch "Stitches" live below, and check out Mendes' upcoming tour dates here.