A song that's not on Selena Gomez's new album has appeared on the internet

A Selena Gomez song that doesn't feature on her new album 'Stars Dance' has turned up online.

Reading between the lines, 'Sad Serenade' may well be about Gomez's rarely-mentioned split with a certain other popstar, but we can't be sure.

Either way, it's quite the toe-tapper and it is, in fact, pretty good.

Here it is: