Listen to Us Against the World (Karaoke Version) [Originally Performed By Christina Milian online. Us Against the World (Karaoke Version) [Originally Performed By Christina Milian is an English language song and is sung by Party Peter. Us Against the World (Karaoke Version) [Originally Performed By Christina Milian, from the album Karaoke Party, Vol. 1, was released in the year 2017. The duration of the song is 3:59. Download English songs online from JioSaavn.