Little Mix's debut single as a three piece after Jesy Nelson quit the band has leaked online sparking an investigation by the group's management.The song, called Heartbreak Anthem, is a David Guetta collaboration featuring electronic duo Galantis.In the track, Perrie Edwards, Leigh-Anne Pinnock and Jade Thirlwall sing about moving on from a break-up over synths.The music video is set to be filmed by the trio in the coming weeks.A source told Daily Star Online: "Little Mix's management are looking into how the song appeared online as a matter of urgency."Heartbreak Anthem is a sugar sweet pop collab with David Guetta and Galantis – it has a 2011 vibe."No artist wants their music to leak ahead of it being announced but with this being Little.
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