Vidya Balan turned 33 Sunday and Sujoy Ghosh, who is directing her in his upcoming movie "Kahaani", wished her a very happy birthday.

"... and to the nutter...to the friend.. .to the actress.. to the (Vidya) Balan.. happy happy birthday.. keep entertaining," Ghosh posted on Twitter.

Co-produced by Ghosh, "Kahaani" will see Vidya as a pregnant woman in search of her missing husband.

After her sexy and bold avatar in Milan Luthria's "The Dirty Picture", the movie will see Vidya in a completely different and unglamorous role. Sharing screen space as the male lead will be her co-actor from "The Dirty Picture", Emraan Hashmi.

" 'Kahaani' trailer this week. lets see how that goes.. and many thanku to all of you who happy new yeared me. i happy u back a little bit more," Ghosh added.