Produced by UTV Motion Pictures, the film is about the ups and downs in the life of a movie star.
"'Heroine' is not inspired by any one person. The movie is about Mahi (Kareena) and her journey towards stardom and the ups and downs that come with it," he said.
"I am not saying it is not inspired by Hollywood or Bollywood, there is inspiration. I would say that 70 percent of it is realistic and 30 percent fiction. It is difficult to pin point one person on whom the movie is based," he said.
Research seems to be the basis for all of Mandhur Bhandarkar's films and the director spoke to many people for "Heroine" as well.
"I have interacted with many people. I wanted to portray today's film industry and its rise and fall," he said.
The film has been creating a buzz for a while now. Initially, after Kareena refused the role, Aishwariya Rai Bachchan had been a part of the film but later withdrew due to her pregnancy and Kareena stepped in.
The director admitted that he altered the script when Kareena came on board.
Kareena said that she had her hands full the first time she was approached but was glad when she got the role back.
"I had no reservations at the time I was approached but I was shooting for 'Bodyguard', 'Agent Vinod', 'Ra.One' and 'Talaash' and I wanted to shoot this film at a stretch. I am happy that they came back to me," Kareena revealed.
The film is all set to hit theatres Sep 21.