Justin Bieber was on familiar territory this week when he stopped by the Ellen show to perform his Changes single "Intentions" with the Migos' Quavo and play a game of "Spill the Tea" with his longtime friend and mentor Usher.Bouncing around in low-ceilinged, neon-lit set featuring alternating horizontal and vertical lines and snatches of lyrics from the song, Bieber worked the stage in his modified lumberjack outfit featuring jean shorts, a flannel, red wool hat and crisp white sneaks, as he