The term 'Lady Who Sings 'Bad Romance'' can be summarized as the singer GAGA, which is a four-letter word. GAGA is the stage name of American singer, songwriter, and actress Stefani Joanne Angelina Germanotta. She is known for her flamboyant and diverse contributions to the music industry through her fashion, live performances, and music videos. Her most popular song, 'Bad Romance, ' was released in 2009 and has since become one of her signature songs.