Tapsee, who plays an undercover agent in the multi-starrer film, said her director initially thought she was too shy to play the part.
"Neeraj sir never thought I can do this. Initially he thought I am too coy to play this role. But then I followed the process and went to him after meeting his casting director.
"I had to first convince him that I am not at all a coy girl in my real life. Before that he only saw me in 'Chashme Baddoor'. Somehow he got convinced about me," she said.
"This is the first movie in my career, which I have chased. By the grace of God, I have got whatever I wanted in my lap. I am the lucky one to extract my character of choice from him (Neeraj)," Tapsee said.
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Her character in the film is shown as trained in self-defense system Krav Maga and she is happy that she could make use of the tough side of her personality for the role.
In the film, Tapsee shares screen space with Akshay Kumar and calls him a 'deceptive' co-star.
"I think he is the most deceptive co-star if you don't know him off screen. Because on-and-off camera he is completely a different. Off-screen he is very calm, focused and relaxed. On-screen he has this superb energy to perform.
'Baby' releases on January 23.