On a promotion spree of her upcoming movie Kahaani, actress Vidya Balan boarded a Brihanmumbai Electric Supply & Transport Undertaking (BEST) bus in Mumbai on Monday in her latest avatar as a woman in the advanced stage of her pregnancy, the character she plays in the film.

Vidya, portraying as Vidya Bagchi -- a pregnant woman from London searching for her missing husband in India -- was out in public showing her real looking baby bump. She chose to travel in Mumbai's lifeline, BEST.

Travelling from Parel to Chowpatty, the actor got nostalgic about her college days. But the bus ride was surely an unusual one as Vidya was accompanied by shutterbugs all along her journey.

Chatting and interacting with her fans, Vidya got her fellow passengers to promise that they would watch Kahaani. Promotions have been one of the most important aspects of film making these days and Vidya has definitely mastered the art along with acting.