Demi Lovato - Heart Attack (Remixes)

Demi Lovato - Heart Attack (Belanger Remix)

Demi Lovato - Heart Attack (White Sea Acapella Remix)

Demi Lovato - Heart Attack (The Alias Club Remix)

Demi Lovato - Heart Attack (Deejay Theory Remix)

Demi Lovato - Heart Attack (Manhattan Clique Remix)

Demi Lovato - Heart Attack (White Sea Remix)

Several remixes of her new single! Which is better? Review!