This song Lamhon Ke Rasgulle from the movie Kahaani 2, sung by Sunidhi Chauhan and Biana Gomes. Lyricist of this song is Amitabh Bhattacharya.
Song Credits:
Song: Lamhon Ke Rasgulle
Singers: Sunidhi Chauhan, Bianca Gomes
Lyrics: Amitabh Bhattacharya
Movie: Kahaani 2