Parisian Pop Princess France Gall would regularly record in Germany from 1966 to 1972, in particular with the composer and orchestrator Werner Müller. She had a successful German career with songs by Horst Buchholz and Giorgio Moroder. For all her German success, many Germans would believe for a long time that Gall was one of their own.
Here are some of my favorites...
France Gall - Hippie Hippie (feat. on the Radioblog)
France Gall - Die schönste Musik die es gibt (Music To Watch Girls By)
France Gall - Ein Bisschen Goethe, Ein Bisschen Bonaparte
France Gall - I like Mozart
Plus: Her German version of Poupée de cire, poupée de son here