VIDEO : Blake Shelton and Gwen Stefani Have Written a Song Together!

Just a day after going public with their romance, Blake Shelton's rep says that he and Gwen Stefani have already written a song together. Though it's unclear whether or not the song will appear on an upcoming album for one of the singers, an industry insider says that it's a mid-tempo country ballad in which Blake returns to his "real country" roots. The source also pays Gwen respect, adding, "It's amazing how good she sounds on a pretty country song." Reportedly, the song is, fittingly, about telling a lover to leave a relationship if that's what he or she really wants.