'Letterman': Did Selena Gomez REALLY make Bieber cry? (Oh come on)

There's been a vast amount of online chatter this morning Monday night's "Late Show with David Letterman" interview with Selena Gomez, in which she jokes about making former boytoy Justin Bieber "cry." It was a joke; the clip's been everywhere; and is now one of those silly Web things that has taken on a life of its own.

But here's the question: Did Gomez really come out with that quip as effortlessly as everyone assumes she did? My bet is no -- it was fed to her. Here's how it works: Dave tells her backstage that he's going to do a brief lead-in about making JB "cry" at which point -- after two beats  -- she is to say something along the lines of "you're not alone." 

This does happen in late night -- where something that seems unrehearsed was in fact very much rehearsed. I'm betting this is one of those instances. Take a look: