The hip-hop newcomer was set to feature their collaboration Partynauseous on his debut, good kid, m.A.A.d city, but Gaga scrapped the song last month (Oct12), blaming her decision on a disagreement with his label bosses.
Gaga has now made up for the move by tweeting an unreleased version of his song B**ch, Don't Kill My Vibe, which features her vocals on the hook instead of Lamar's.
An accompanying music video shows Gaga goofing around with her friends while travelling through South America on her current Born This Way Ball tour.
Producer DJ White Shadows, who uploaded the clip, writes, "We feel bad about killing your vibe, so here's the demo you never got to hear. And the chillun (sic) in Rio, and backstage in Colombia."