How many movies have Helga Billian and Renate Ewert collaborated on?

They have worked on 3 movies together! Their first movie together was Mein Schatz, komm mit ans blaue Meer (1959) while their highest rated movie together was Schlagerparade 1961 (1961). They have not worked together since Schlagerparade 1961 (1961). They are most known for their comedy films together.