It came after much speculation that the pair were officially dating.
However, he has in the past admitted that there was nothing going on between the two, he had just worked on her Melodrama album.
Now, Lorde has addressed the dating rumours as well, on an Instagram Live with fans.
One fan asked her straight if she were dating Jack, and she responded, "Guys, no!" while laughing.
"Jack and I are not dating. For the last time. But I love him. He's awesome. But we're not dating."
We guess that's that then fam.