Kareena Kapoor is mighty excited about her upcoming film 'Heroine' and says that the movie is her most 'special film', up till now. The actress revealed that she's worn over 150 costumes, in the film, which is a record in itself. Talking to the media at a recently held event, the actress said, "Heroine is my most special film and Madhur Bhadarkar's most ambitious film. We have used over 150 costumes in the film, which I think has never been done before in any Hindi movie." Team 'Heroine' will auction all 150 costumes, post the release of the movie. When quizzed about the same Kapoor said, "Obviously it's a pleasure to auction all the costumes after the film." Kapoor will essay the role of a film actress, Mahi Arora, in the movie, which also features Randeep Hooda and Arjun Rampal in the lead roles. Directed by Bhadarkar, 'Heroine', is expected to release on September 21, 2012.