This song is from a 1999 Indian Hindi-language romantic drama film, Hum Dil De Chuke Sanam (English: I Have Given My Heart Away, Darling) directed by Sanjay Leela Bhansali. The film stars Salman Khan, Ajay Devgn and Aishwarya Rai. The music of the film was composed by Ismail Darbar with lyrics by Mehboob. This song was sung by Kavita Krishnamurthy, Kumar Sanu.
This whole soundtrack was beautiful.