The period film, directed by Sanjay Leela Bhansali, tells a love story of Maratha warrior Peshwa Bajirao (Ranveer Singh) and Mastani (Deepika).
"There is a kathak song in the film. It has been choreographed by Pandit Birju Maharaj. In fact, I was in Delhi for a week for one-on-one sessions with him," Deepika told reporters here at a promotional event of the movie.
"Bajirao Mastani" also stars Priyanka Chopra in the role of Bajirao's wife Kashibai.
Deepika said she was happy that "Pinga" was the first song that she shot for the movie as she had Priyanka for support.
The movie is slated to release on December 18.