what language is que sera sera

"Que sera sera" is a phrase in Spanish that means "whatever will be, will be"). However, the phrase as it appears in the famous song by Doris Day is not grammatically correct in Spanish or Italian). The songwriters, Jay Livingston and Ray Evans, took the phrase from a 1954 movie, The Barefoot Contessa, where it was used as the familys motto. They changed it to "que sera sera" to appeal to U.S. viewers who were more familiar with Spanish than Italian.