"Padman" is based on life of Arunachalam Muruganantham, who invented first low-cost sanitary napkins in the country.
"It (shoot) is going very well and Mr Muruganantham was also there. It's a wonderful project. It's a film which will bring awareness about something which has so far been cloaked and shamed and I am very happy to be a part of the film," Twinkle told reporters here at an event.
Actress Sonam Kapoor will also be seen in a special role in the film to be directed by R Balki.
Twinkle was talking on the sidelines of launch of French Browns, by L'Oreal Professional.