LONDON: It could be the night of the diva in Madrid at the MTV Europe Awards on Sunday, with Lady Gaga and Katy Perry leading the field with five nominations apiece and "Desperate Housewives" star Eva Longoria hosting the event. The U.S. singers go head-to-head in four categories - best pop act, best song, best female act and best video - at one of the music industry's biggest annual showcases outside the United States.