Shahid and Sonam shoot a judaai song that proves to be an ice breaker for the two co-stars currently shooting for Mausam

It hasn't been an easy time for Shahid Kapoor and Sonam Kapoor while shooting Mausam. Up until recently, we hear the two could barely stand in the same frame.

Says a source, "Shahid and Sonam are different kinds of actors. Shahid likes to rehearse and get his dialogue and expressions right before the final take. Sonam is more spontaneous, and impulsive in front of the camera.

When Raakhee Gulzar worked with Amitabh Bachchan, she faced the same problem. He got better with every take, while she lost her concentration and became laboured with every extra take."

Likewise, every retake the actor got left Kapoor agitated. But their differences melted when they shot a separation song. "The location crackled with their chemistry, " adds a source.

"We don't know what it was. But something definitely happened to finally break the ice between Shahid and Sonam. While earlier there was a wall of reserve between the two, the judaai song made it okay."

When the two faced the camera, it was like they knew exactly how to complement each other on screen. Sonam was dressed in a simple salwar kameez and Shahid wore an Indian Air Force uniform. And they looked like they couldn't keep away from each another for a second. Director Pankaj Kapoor was finally able to heave a sigh of relief, " he says.

Kapoor doesn't deny the chemistry that the crew witnessed. "It just happened, I guess. After shooting together for so many months, we were bound to come around. The song has turned out to be very special. We both got swept into the emotional vortex of the words and tune, " says the actor.