The scene will also have glamorous Neha Dhupia, and Rajat wants to look equally attractive.
"Well, even I am conscious about my looks. Jokes apart, I want to look as lean as possible. I am in the same frame as Neha Dhupia," he said.
Apart from taking up a special diet and physical training, Rajat, who was seen in films like "Monsoon Wedding" and "Bheja Fry", has also been practising dropping the towel with flair.
"The truth is that I have never gone to gym in my life, but for the first time I am going through such a tough workout session," he added.
As the title suggests, "Raat Gayi Baat Gayi" is a humorous take on one-night stands. The comedy revolves around a married couple, their friends and one night of passion that turns their lives topsy-turvy.
The film also has Vinay Pathak in the pivotal role.
Sanjay Leela Bhansali picturised something similar on Ranbir Kapoor in "Saawariya", but it was edited out from the film.