Hildegard Frieda Albertine Knef (German: [ˈhɪl.də.ɡaʁt ˈkneːf] (listen); 28 December 1925 – 1 February 2002) was a German actress, singer, and writer. She was billed in some English-language films as Hildegard Neff or Hildegarde Neff.

Source: Wikipedia (https://en.wikipedia.org/wiki/Hildegard_Knef)