Taylor Swift, Justin Bieber, The Weeknd. Our “American Music Awards” blowout with the most memorable moments. Plus, we’re running down all the best “AMA” fashions ET Style! “Dancing With The Stars”: The Final Four! We’re getting you ready for tonight’s ballroom battle for the Mirror Ball Trophy! Then, ET is exclusively with Derek and Julianne Hough as we go behind the scenes of their Disney Holiday Special. And, Melissa McCarthy and Ben Falcone spill major secrets from their comedy “Superintelligence.”