The film which is produced by Dhanush's father Kasthuri Raja and features music scored by Anirudh Ravichander.
The film is expected to be released in January 2012.
The single track 'Why This Kolaveri Di', written and performed by Dhanush, was initially leaked on the internet. Having noticed its popularity, the makers launched the song as a single.
The album of '3' has songs sung by Vijay Yesudas, Mohit Chauhan, Anirudh and newcomers Satya Prakash and Ajeesh.
There were speculations that Shruti Hasan was not a part of the project and actress Amala Paul was to be roped in. But Haasan eventually stayed with the project.
Tamil star Dhanush shakes a leg on stage to Kolaveri Di at the music launch of his upcoming film '3'.
The film '3' stars Dhanush along with Shruti Haasan.
'3' is a remake of Rajinikanth's superhit 1982 film 'Moondru Mugam'.
Dhanush is a national award winner and is said to have a lip-lock scene in the film '3'.
Siva Karthikeyan and Aadhavan were the hosts of this event.