(For the Telugu film, see Chammak Challo (film).) "Chammak Challo" is a song composed by music director duo Vishal-Shekhar and Giorgio Tuinfort as a part of the soundtrack for the 2011 Bollywood film Ra.One. The female vocals were provided by Hamsika Iyer while male vocals were provided by Akon. It is his first musical collaboration with Indian artists. There are four other versions of the song in the album, including a remix by Abhijit Vaghani, another remix by DJ Khushi and an international version sung solely by Akon. The song, along with the rest of the soundtrack, was officially released on 12 September 2011. However, the song faced controversy when the rough version was leaked on the Internet on 31 May 2011.