Bollywood's heartthrob Ranbir Kapoor is a charmer -- while shooting for a scene with sex workers for his forthcoming film "Rockstar", he sang for them to ease their tension before the shot.

A scene in Ranbir's upcoming film "Rockstar" shows him playing the guitar and singing for sex workers and director Imtiaz Ali wanted to shoot it in a real location rather than creating sets, so the director decided to shoot it in Grant Road here.

On the day of the shoot, the women were excited at the prospect of meeting Ranbir but were even more nervous about the shoot. To help them feel comfortable, both Ranbir and Imtiaz had a friendly talk with them.

"They (the sex workers) were very shy initially. They were reluctant about coming in front of the camera... but Imtiaz and Ranbir spent some time talking to them and created a comfortable environment after which we commenced shooting, " said a source.

The actor, who had taken extensive guitar lessons to prepare for his role, actually played it live and sang the verses himself, leaving them captivated.

"Once the shoot was over, some of them even took pictures with Ranbir and requested for autographs; and Ranbir happily obliged. They wished Ranbir and Imtiaz good luck for the film's success, " the source added.