After guesting on yesterday’s season premiere, Usher returned to “The Ellen DeGeneres Show” for an encore appearance. This time, Usher performed his hit single “DJ Got Us Fallin’ in Love,” where he showed off his fancy footwork backed by a gang of dancers. If it’s any indication of what to expect on his upcoming “OMG Tour” with Trey Songz, then he’s going to have stadiums across America on fire.