"You know Yash ji is very senior and everyone used to say how young he is at heart. But you have to look at how sharp he is," Katrina told reporters here.
"He used to pick up these very small things… like if something was disturbing me or I was not in a good mood, he used to just pick it up and know how to deal with it. So I think he is a very special person and we had an amazing time," she added.
Katrina was in London to work on Chopra’s yet-to-be-titled love story opposite superstar Shah Rukh Khan.
This is her first project with King Khan, and this is also the first time she is being directed by Chopra, whose last venture behind the camera was "Veer Zaara" in 2004.
Katrina, 27, spoke on the sidelines of the launch of a book based on her film "Raajneeti", which presented her in a non-glamourous avatar and in a powerful role.
She didn’t miss the chance to share sweet somethings about her "Raajneeti" director Prakash Jha too.
"One thing I can say about Prakash ji is that with all his knowledge and with all his intellect, he is an extremely intelligent person and extremely knowledgeable…
"… especially on the subjects that he directs… (they) are often very complex subjects, but never for once does he make you feel that you are slightly inferior in anyway to the knowledge of politics or his knowledge of literature," said Katrina.
Last seen in "Mere Brother Ki Dulhan", Katrina is also working with her former beau, actor Salman Khan in "Ek Tha Tiger".