Directed by debutant Rakesh Ranjan Kumar, the film is expected to hit the screens after the Indian Premier League (IPL) cricket tournament ends in May.
"I am very excited about the project and I have challenged myself with it, " Dhupia told in an interview in Macau to promote an integrated leisure and entertainment resort City of Dreams of which she is the official celebrity guide.
"Preparation goes in everything you do in life, whether it is promoting a project like City of Dreams or doing a film like 'Dear Friend Hitler', " said Neha.
In the film, Neha plays Eva Braun and is paired with Raghubir Yadav who will be seen as Adolf Hitler. The international cut of "Dear Friend Hitler" will be released in German, French and English without the songs.
"I am playing Eva Braun who has been a mysterious character forever. It was definitely a challenging role but I would say that I will express myself through my eyes. I have worked very hard on my look and it took time to perfect it, " said Neha.
Speaking about City of Dreams, Macau, Neha said: "It is a perfect destination for families and I have visited almost all the countries around the globe and this is one of the best places in the world."