Mumbai (Maharashtra), Jun 27 (ANI): Bollywood actress Manisha Koirala will be essaying the role of Nargis Dutt, in Rajkumar Hirani's film 'Sanju'. For the first time in her career, she shared the screen with Ranbir Kapoor. While talking about his co-star she said, "It was fantastic working with Ranbir Kapoor. He is a very good actor, very hard working, I think he is born for genius kind of performances, and you know acting is in his blood. He is a very pleasant person to work with because he is a very well-behaved and well-brought up person. I was really shocked when I saw the rushes of 'Sanju'. I could not differentiate between the Ranbir Kapoor and Sanjay Dutt, he did a brilliant job."