Pink, Lady Gaga and Christina Aguilera led female artists of pop music dominating the American Music Awards stage on Sunday with powerful performances, despite being edged out by male artists in most award categories this year. Bruno Mars won Artist of the Year, former One Direction member Niall Horan won New Artist of the Year and Puerto Rican singer Luis Fonsi, Justin Bieber and Daddy Yankee won Collaboration of the Year for the catchy "Despacito."