Vidya Balan has embarked on a new mission in Kahaani

On a good day, Bollywood star Vidya Balan spends her time weaving in and out of a crowded Mumbai railway station with a fake pregnant belly strapped to her body. Throw in a staggering 43 interviews, and you've got a Balan bad day."It gets really crazy at times," says Balan . She was on her way to the airport to catch a flight to Delhi to continue her unusual promotion of Kahaani, her latest film, which premieres at Dubai's Grand Cineplex.

"It's a lot more exhausting and tiring during promotions because there's no other known face in the film," adds Balan, who has parlayed her earlier film successes — The Dirty Picture, Ishqiya, Paa — into this role, which sees her carry much of the film alone.Directed by Sujoy Ghosh, Kahaani is a tale of London-based Vidya Bagchi, who embarks on a mission to find her missing husband. She's seven months pregnant when her husband-hunt leads her to vibrant Kolkata. Unlike her last film, the award-winning risque drama The Dirty Picture, she doesn't have popular actors Naseeruddin Shah and Emraan Hashmi bolstering the film by lending it extra star power.