Former sweethearts Katrina and Ranbir gear up to play similar roles, albeit in different movies

Even before Ranbir Kapoor sets to rock the big screen as a rockstar in Imtiaz Ali's next, his rumoured ex Katrina Kaif has managed to master the art of playing the guitar.

The actress, who apparently plays a musician in the film, was so keen on getting her notes right she that would ardently practice the guitar whenever she'd get the time.

Thankfully, for her, there was a well-established musician within the crew to help her from going out of tune.

Says Pakistani singer Ali Zafar who also plays an important part in the film, "Katrina is a very curious girl and quite keen on learning new things.

I used to tease her a lot about the way she used to hold the guitar and play it. But she made sure she got it right. "

A song in the film called Dhunki required the actress to perform in front of a huge crowd, and she obviously wanted to get her moves right.

Adds a source, "She is someone who lived on fruits, and kept away from anything oily for two months before Sheila Ki Jawani was shot. That way, she is quite obsessive about getting her act right. "

Clearly for Katrina, whose roles have been as conventional as it gets, to play a rock chic even for a day was a bigger challenge.

Adds Ali, "It is easy to typecast someone, but I always used to tell her that I want to see her with kohl under her eyes, messy hair and completely wild. I must say she managed to do justice to it too. "

The actress will also share the stage with Ali Zafar and Imran Khan during the promotions of the film where they plan to perform gigs across different cities.