"You should not have seen that look. It was leaked by the media... I will admit it was upsetting that the look was out as we were saving the look to reveal much later.
"We are enthused with the response from the public but we wish the media had respected the privacy of the film and not revealed the look," Dia told reporters here.
In the Rajkumar Hirani-directed film, Dia plays the role of Maanayata, Dutt's wife.
"Right now we all are tight-lipped about the film but we can't wait to reveal things."
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Dia has teamed up for the first time with Ranbir.
"Ranbir is amazing and there are no two ways about it."
The film also stars Vicky Kaushal as Sanjay Dutt's close friend, Manisha Koirala as Nargis Dutt and Paresh Rawal as Sunil Dutt.
"I am looking forward to experience the love and appreciation that Priyanka Chopra has garnered. It will be interesting to see," she adds.
Taking about the socially relevant films, which released last year, she said, "It was an interesting year as many socially relevant topics were explored... My top three favourite films were 'Neerja', 'Pink', 'Dangal'.
"There is an incredible body of work at display...It's difficult to vote. I hope we continue to grow like this.