Watch Hayley Williams Harmonize With Joy Williams on 'Hate to See Your Heart Break' [Fresh Vid]

Paramore singer Hayley Williams and Joy Williams, formerly one half of The Civil Wars, aren't related. But you'd be forgiven for thinking otherwise, considering how they harmonize on "Hate to See Your Heart Break," their first collaboration in their almost-15-years-long friendship. The song originally appeared on Paramore's 2013 self-titled album. And this enhanced version will appear as a bonus track on an upcoming deluxe edition, which hits digital outlets tonight.

"I love that I got to sing this with someone who I have shared my pains and my stories with for quite some time," Hayley told NPR's Ann Powers. "I think of it as an ode to sisterhood. Close friendship between women who share their stories with each other and who lift each other up and understand one another."

Check out the video, filmed during sessions to record the new duet vocals at Santa Monica, Calif.'s Village Recorders, above, and read the rest of the interview here.