Watch Cimorelli Cover Demi Lovato's 'Heart Attack' (VIDEO)

Watch the all-sister troupe Cimorelli cover Demi Lovato's "Heart Attack."

Watch Cimorelli, aka SIX SINGING SISTERS, cover Demi Lovato's "Heart Attack."

I'm an only child, so the thought of having SIX siblings -- let alone SISTERS -- is quite frankly scary as hell. That said, if I did have six sisters, I'd probably spend most of my time being jealous of their clothes, as opposed to FORMING A TOTALLY SUCCESSFUL BAND like the all-sister group Cimorelli. Yep, Cimorelli is six pop music-loving sisters -- Christina, Katherine, Lisa, Amy, Lauren, and Dani Cimorelli -- who went viral on YouTube covering songs like Taylor Swift's "22" and One Direction's "What Makes You Beautiful." And now that we've given them a proper intro, check out Cimorelli's latest cover of Demi Lovato's "Heart Attack"!

Watch Cimorelli cover Demi Lovato's "Heart Attack" after the jump.

Armed with only their voices and an acoustic guitar, Cimorelli give "Heart Attack" the a cappella treatment, swapping the the original production for a stripped-down, organic version complete with six-part harmonies. And sure, we know that "a cappella" anything tends to get a dorky reputation, but worry not -- Cimorelli comes with a TON of cred. In just two days, their "Heart Attack" video got nearly 500K plays on YouTube and even earned a global hashtag on Twitter, "#CimorelliHeartAttackTonight." Yeah, calling up my three girl cousins THIS INSTANT to ask if they wanna get together for a "jam sesh" later.

+ Watch Cimorelli cover Demi Lovato's "Heart Attack."

Photo credit: Cimorelli's YouTube

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