Big B is currently filming the last leg of Shoojit Sircar's production 'PINK'. The actor took to Twitter and posted the above picture where he is seen playing a lawyer in the film.The 73-year-old actor wrote on his blog, "The relish with which films are made is a film by itself .. working on the final days of 39PINK39 is a delight and a nightmare simultaneously and not necessarily in that order .. hehaha .. the pages and pages of lines is well beyond human consumption for me at this moment .. and so this missive is short and hopefully sweet .."'PINK' also stars actress Taapsee Pannu who was last seen in 'Baby' and will be directed by Bengali filmmaker Aniruddha Roy Chowdhury, who helmed the 2006 National award-winning film 'Antaheen'.The release date of the film is yet to be locked.