In anticipation of the film's release, the two singers sat down to discuss the creative process and inspiration behind the song.
"Kacey got involved when we wanted to have a female voice on there because there are a couple of really strong female characters in the film," Foy said in the video.
"When I first heard the song 'Moonshine' I got a really fun Southern vibe from it and I thought that it would be kind of a fun challenge for me to figure out how to mix in my own flavor and my own bits of harmony to the song," Kacey said.
Guys, I'm obsessed with this song -- it's so good.
Hear the full track below.
"Live By Night" is a crime drama based on Dennis Lehane's 2012 book of the same name.
The movie will follow a man named Joe Coughlin as he moves to Ybor City, Florida to become a bootlegger, and eventually a gangster.
It will feature performances by Ben, Elle Fanning, Brenden Gleeson, Sienna Miller, Chris Messina and Zoe Saldana.