Born in Rostock, Hoppe became a leading lady of stage and films in Germany. She was born into a wealthy landowning family and was initially privately educated on her fathers private estate. Later she attended school in Berlin and in Weimar, where she began to attend theatre. Hoppe first performed at 17 as a member of Berlins Deutsches Theater under director Max Reinhardt. In 1935 she was hired by the controversial German actor and Director of the Prussian State Theatre under the Third Reich, Gustav Gründgens. They were married from 1936-46, until their divorce. Speaking years after the marriage had ended Hoppe stated, He was my love, but never my great love, that was work. One of the characters in the film Mephisto was reportedly based on her. Hoppe made no secret of her contacts with the Nazi elite in the 1930s/40s, including being invited to dinner by Hitler. Her role in Der Schimmelreiter (The Rider of the White Horse, 1934) made her famous almost overnight, while her Aryan face made her a darling of the Nazi elite. Later Hoppe would label this period of her life as the black page in my golden book. During her time acting at the home of the Prussian State Theatre, the Schauspielhaus, Hoppe developed her analytical approach to acting, which she stated consisted in her taking apart every sentence and giving the use of language a brilliance.