Vidya Balan is all set to shed her extra fat for her role in a film that also stars Shahid Kapur.

According to a unit member from Mirza's film, "Vidya has been asked to lose at least fifteen kilos before she starts shooting for this film. Although the film is a love story between a younger boy and an older woman, the actress needs to look better than what she looked in ‘Heyy Babyy'."

It is learnt that Vidya has begun working out so that she looks perfectly in shape before starting the film.

"Shahid as it is looks like a kid in front of her. She is older to him but they cannot afford to make her look like his mother in the film," said an industry source.

"Vidya has a pretty face and is a promising actress all she needs to do is keep herself fit like most of today's actresses do," added the source.