At the trailer launch of his much anticipated film 'Shamitabh', Bollywood megastar Amitabh Bachchan said he will not rule out the possibility of working with the veteran actress Rekha in future films. Amitabh Bachchan and Rekha are considered to be an all time popular on-screen pair in Bollywood and the two have starred together in films like 'Silsila', 'Mr Natwarlal', 'Muqaddar Ka Sikandar'..