The actor was seen sporting a scruffy look for the film, which also stars Parineeti Chopra, and took to Twitter to share the new look.
While posting a black and white image of himself with the moustache, he shared: "Going for the clean shaven look. I tried this. Hitler/Chaplin meets Mehmood. Got rid of my beard. 'Meri Pyaari Bindu'."
In the image, with a dressing table in the background, the "Dum Laga Ke Haisha" star has kept a dead pan face.
He gives an impression of the late English comic actor, filmmaker, Charles Spencer "Charlie" Chaplin, who was known for his small moustache.
The 31-year-old appears to have posted the photograph on the micro-blogging website in the midst of the shaving process.
Ayushmann will be seen essaying the character of an author named Abhimanyu Roy. Set in Kolkata, the film is directed by debutant Akshay Roy and is a Maneesh Sharma production.
Parineeti will be seen essaying the character of an aspiring singer in the Yash Raj Films (YRF) movie and will also croon a number for it. According to reports, Ayushmann will also be singing in the film.