Al Pacino was born into a family of Italian immigrants in East Harlem, New York City, while Robert De Niro came from an Italian-Irish background with his part-Italian father, Robert Sr. and part-Irish mother, Virginia - both artists.
Though they came from families with an Italian background, neither speak Italian fluently; they spent months to learn to speak Italian to play their respective roles in "The Godfather" movies.
Check out 15 Things You Didn’t Know About 'The Godfather' featured on MentalFloss.com.
And here are 11 of the most linguistically-talented A-listers compiled by MarieClaire.co.uk.