Vidya Balan will shed a few more kilos for her role as South siren Silk Smitha in Balaji's Dirty Pictures. After the release of No One Killed Jessica, the actress will devote all her time to get in shape for the role.

A source reveals Balan's preparation for the role. "She will work out and lose more weight for the role. The brief is not to look lean and skinny, but curvy.

Silk Smitha was famous for her curves and Vidya wants to ape that look. However, she feels that it's necessary for her to lose some more weight before getting into the skin of the character.

Her portrayal of Smitha won't be through daring outfits but the body language and dance numbers."

In fact, Dirty Pictures director Milan Luthria has asked his leading lady to take three weeks off to rehearse for the songs.

"She will be working with two choreographers one from the south who will teach her the steps Smitha for famous for.

Another will be from Mumbai. The songs won't be cheap or vulgar but choreographed in an aesthetic way."

Neither producer Ekta Kapoor nor her director want to sensationalise Smitha's story. "They are keen to portray her story with lot of respect and dignity.

Even though Silk Smitha is iconic because of her seductive numbers, Vidya has made it clear she won't be doing a lot of skin show in the film."