December will witness one of the biggest clashes in Bollywood. Rohit Shetty?s Dilwale starring Shah Rukh Khan, Kajol, Varun Dhawan and Kriti Sanon will lock horns with Sanjay Leela Bhansali?s dream venture Bajirao Mastani featuring Ranveer Singh, Deepika Padukone and Priyanka Chopra on December 18.