How many movies have Alex Klaasen and Niek Barendsen collaborated on?

They have worked on 2 movies together! Their first movie together was Alex Klaasen: Eindelijk alleen (2010) while their highest rated movie together was De Alex Klaasen Revue: Showponies 2 (2021). They have not worked together since De Alex Klaasen Revue: Showponies 2 (2021).