Taylor Swift won big at the American Music Awards Sunday night. She won all six awards she was nominated for, including Artist of the Year. The only other multiple winners, with two apiece, were Kendrick Lamar, BTS, Harry Styles, and Bad Bunny. The legendary Lionel Richie took home the Icon Award, presented by Smokey Robinson. Stevie Wonder and Charlie Puth took to dueling pianos to pay tribute to him, then…