Nate wasn’t sure that he wanted to be on a collaboration with a pop star. Their label is an independent label, they weren’t sure. And I just kept telling them—well, I kind of tricked him into doing it, because we wrote the first verse the first day and basically the chorus, and then I went home and I was looking over the lyrics and thinking about the song, and it was never supposed to be a collaboration. We were just collaborating as writing partners. But I was like, “This song is a conversation between lovers.” And he had to do it because he’s my favorite voice right now, aside from probably Adele.
P!nk talks about Nate Ruess. (source)
Also in this interview, P!nk confirms she will be performing at the Grammys. That could mean that they’ll do JGMAR, because that’s the song of hers that is most likely to be nominated. But not necessarily… fun. didn’t sing We Are Young last year.