 After initial talks with actresses Kangana Ranaut and Bipasha Basu fell through , Vidya Balan was offered the lead role . When Balan was narrated the script and shown sketches of what she needed to wear for the portrayal , she felt uncomfortable . Luthria added , " We couldn 't have found anyone better than Vidya for this role . It 's a casting that very few would think is viable because it is going to be nothing like Vidya has done before . But I am confident she will push the envelope as far as she can " . 
