Listen to Diwani Diwani (From "First Love Letter") online. Diwani Diwani (From "First Love Letter") is a Hindi language song and is sung by Lata Mangeshkar and S.P. Balasubramaniam. Diwani Diwani (From "First Love Letter"), from the album Dil Mein Mohabbat Hai - Bollywood Romantic Songs, was released in the year 2016. The duration of the song is 8:36. Download Hindi songs online from JioSaavn.