Don't worry, though. We didn't, either. That is, until he swung by the Late Show With David Letterman Wednesday to serve up the "Top Ten Little-Known Facts About Justin Bieber."
Among the tidbits of personal info the teen sensation revealed? That he once served eight months in prison for siphoning gas, he accidentally waited in line for two hours for his own autograph, he's really the Green Lantern, and, as hard as he tries, he simply doesn't know how to not be adorable.
Although, on that last one, Selena, we're pretty sure you can relate.