Tabu and Amitabh Bachchan shared the screen in R. Balki’s 'Cheeni Kum' in 2007, and now filmmaker Ravi Chopra’s wife, Renu Chopra, has revealed an unknown fact — the duo were initially set to share the screen in the 2003 family drama 'Baghban', but Tabu’s role as Amitabh’s on-screen wife eventually went to Hema Malini.