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Sixteen-year-old Austin Mahone's star is set to explode with his new single Say Somethin, and only ET has the exclusive behind the scenes footage of his brand-new music video!

Mahone first got discovered when his videos on YouTube went viral, but that's not the only thing in common he has with pop superstar Justin Bieber -- as you can see from the exclusive footage, he already has a massive, highly dedicated fan base who already know all of the words to his songs.

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"He's amazing, he's perfect," one fan says in tears when she snaps a photo with him. "He's everything. It's crazy, a dream come true."

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Austin, who just signed to Chase Records/Universal Republic, will be making his TV performance debut on Live! with Kelly & Michael on September 20th.

Check out the video to see the next big thing in pop music!