Nayantara, the most sought after actress of South India, is on roll. The actress, who is on a signing spree, has now given a nod to feature in an item number. Well, the Billa girl will be doing a special number in Dhanush's home production Ethir Neechal. Reports add that the shooting of the song has already been started and expected to complete by December 12. The song is being picturised colourfully and it is targeted towards masses. It has to be noted that Dhanush and Nayantara's chemistry had worked big time in blockbuster Yaaradi Nee Mohini and the movie bosses are expecting to repeat the magic again.