How many movies have Dorothea Neff and Susi Nicoletti acted in together?

They have worked on 4 movies together! Their first movie together was Das singende Haus (1948) while their highest rated movie together was .. und wer küsst mich? (1956). They have not worked together since Ich heirate Herrn Direktor (1960). They are most known for their comedy films together.