Vaani, who was last seen in "Befikre", will feature in the Karan Malhotra-project, which is set in the 1800s and chronicles the story of a dacoit tribe fighting for their right and independence from the British.
"I come from a non-film background, so in your head also you build apprehensions about people you've heard of. This ice, that one needs to break, I'm very bad at it. But Ranbir has been so kind and welcoming to me," she added.
"Shamshera" features Sanjay Dutt as the antagonist. When asked if she will be seen doing action sequences in the film, Vaani said it is a "possibility".
"There is a very different, cool, quirky sense of this character that, of course, I've never played before, but also you don't get to see too often. There could be a possibility of you seeing me do action but I believe there's a lot more to the character that you'll be seeing," she said.
Vaani was speaking at the launch of Marks & Spencer's new spring summer collection on Thursday. The actor walked the ramp for the brand, which has come out with a "Rethink" philosophy for style.
"I feel I'm blessed. I'm grateful to the directors who have cast me in big films like these, the magnum opus that they are being called. I'm so fortunate to work with such talented co-actors at such an early stage of my career.
"I'm yet to shoot a lot with Ranbir but I've shot extensively with Hrithik and he's extremely kind, nice and too wonderful," she added.
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