The trailer was launched on July 25 on TV and the internet. Director Madhur Bhandarkar has said he is extremely happy at the public response, NDTV Movies reports.
"I am overwhelmed by the great response the promo has got. This is just the beginning," he said.
With the tagline "The story of a girl who lives a new life everyday", the three-minute trailer includes a range of images of Kareena Kapoor, scenes from the song 'Halkat Jawani', and some of the love-making sequences with Arjun Rampal.
Heroine tells the story of Mahi Arora, played by Kapoor, and depicts the highs and lows in an actress's career.
Bhandarkar has described it as a career-defining film for Kareena Kapoor.
The trailer amassed 1.57 million YouTube views in four days after its release.
Produced by UTV Motion Pictures, Heroine will release September 21, 2012.