The 'dirty' actor of Bollywood, Vidya Balan, was seen riding a bus on Monday as a part of promoting her upcoming film 'Kahaani'.

She boarded a Brihanmumbai Electric Supply and Transport Undertaking (BEST) bus on Monday from Parel to Chowpatty to promote the film that is scheduled to release on March.

According to reports, Balan was dressed like a woman in the advanced stages of her pregnancy, the character she is portraying in the film.

Vidya is playing the character called Vidya Bagchi, a pregnant women who comes to Kolkata from London in search of her missing husband.

In 2011, Vidya had scorched India as she portrayed southern siren Silk Smitha in 'The Dirty Picture'.