Bipasha calls Karan a "brat and a chatterbox".
"It's a good thing because all the ice broke on day one. The question of discomfort is not there as you already have a rapport. Both of us had developed a friendship before we went to Kerala to shoot the intimate scenes and the 'Katra' song," she said.
The sensual scenes between the two have raised quite a few eyebrows, but the trailer and the film's songs have grabbed eyeballs before the movie's release Jan 16.
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Directed by Bhushan Patel, "Alone" will see Bipasha in the role of conjoined twins. The shooting was tough for her.
"The shooting was difficult as I had to be joined with my body double; first as Sanjana, and after a change of hair and make-up as Anjana. Shooting for 'Alone' was a unique experience as we had to take care of the distances and other technicalities while shooting the conjoined twins," she added.