YouTube-Grown Duo Karmin Make the Cover of Rolling Stone

Karmin, whose astronomical success on YouTube lead the pop duo to a record deal in 2011 and a guest performance spot on Saturday Night Live this year, will now grace the cover of Rolling Stone magazine.

The issue hits newsstands Friday with Amy Heidemann -- the female half of Karmin -- front and center. Karmin earned the cover slot by winning Rolling Stone's crowdsourced "Women Who Rock" competition.

"Are you serious? Oh my god. ... The fans are going to be so excited," Heidemann said, holding back tears when Karmin discovered it had beated out British singer-songwriter Rita Ora to be on the cover.

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