How many movies have Nanni Erben and Regina Ziegler collaborated on?

They have worked on 5 movies together! Their first movie together was Wunschkinder und andere Zufälle (2003) while their highest rated movie together was Ich leih’ mir eine Familie (2007). They have not worked together since Überleben an der Wickelfront (2012). They are most known for their comedy films together.