Katrina Kaif might have played love interest of many Bollywood heroes in numerous films, but a unique offer has come her way which requires her to play romantic lead opposite Amitabh Bachchan. The director of films like ‘Patiala House’ and ‘Kal Ho Na Ho’, Nikhil Advani wants Kat for a highly unconventional role in his next film ‘Mehrunnisa’, wherein she would be cast opposite the legendary Big B. Not that Kat’s been unable to prove her mettle in the industry with her acts, but this seems like a real challenge for her. Reportedly, she has been approached personally by Nikhil to play the role. Going by the revelation made by a source, it has been learnt that she will be required to play the role of a 20-year-old whose journey will be traced right up till she is 60. Besides playing the love interest of Amitabh Bachchan, Kat would also have to play the role of an older woman. A source said, “Nikhil is adamant on having Katrina on board. He even flew to London just to be able to narrate the film to her. The final call will be taken when Kat returns to Mumbai.”