The film's main lead, Madhuri, couldn't come for the do, but Juhi Chawla was there.
Juhi and Madhuri will be seen together for the first time in "Gulaab Gang" and the former said: "We were rivals at our times and we hardly used to talk to each other. We only used to meet during the awards functions. When we worked together, our differences were sorted."
"I am playing a negative role in the film," added Juhi.
Sinha said he had a great time working with Madhuri and Juhi.
"In fact, we wrapped up shooting for our film before the schedule," he added
Sudhir Mishra, Sudeep Sircar among others were present at the party.
The film, loosely based on Uttar Pradesh-based social activist Sampat Pal and her Gulabi Gang, which works towards liberation of women in the state, is being directed by Soumik Sen.