Could you imagine if Camila Cabello went through with singing Halsey's part of the Chainsmokers' song, Closer?! Which one would you have preferred? "Basically I recorded that song and so [The Chainsmokers] were like 'oh do you wanna be on the song?' and I loved the song. But I had to turn it down because I was with the group at the time and we were like about to put an album out and so I didn't wanna...you know, I always try to do my solo stuff off-cycle and so that was like, super-on and I had to say no. And then it was like the number one song in the world."