Actor Ranveer Singh will be seen promoting his forthcoming historical-romance film “Bajirao Mastani” on the popular reality show “Bigg Boss Nau”.While his co-star and rumoured girlfriend Deepika Padukone promoted her romantic-drama film “Tamasha” last month on the Colors' show, Ranveer will enter the “Bigg Boss” house without her.He will be seen finding his partner in the house, where all the female contestants will face a quest to become Ranveer's “Mastani”.The episode of “Bigg Boss Nau” featuring the “Band Baaja Baaraat” actor will be aired on Sunday.“Bajirao Mastani”, which has been directed by Sanjay Leela Bhansali, also stars Priyanka Chopra.It will release on December 18.