Top ten American celebrities you may not know are Irish

Steven Buscemi, star of HBO's "Boardwalk Empire", traces his roots to Ireland

He is the second president to have been the son of a former president and, surprisingly, he traces his roots to the Emerald Isle. Bush’s five-time great grandfather, William Holliday, was born in County Down during the mid eighteenth century and later moved to the US.

The 43rd president of the United States George W Bush can trace his roots back to the Emerald Isle...who knew!

9. Sharon Stone

Golden Globe winning actress, Sharon Stone, was born in Pennsylvania in 1958. She is best known for her performances in Basic Instinct and Casino. She has worked in the Middle East to promote peace and has been involved with various charities throughout her career. Stone’s paternal grandfather emigrated from Ireland to Louisiana, where Stone’s father was born.

10. Philip Seymour Hoffman

Oscar winning actor, Philip Seymour Hoffman, was born in New York in 1967. He has starred in films such as Capote, Doubt, The Ides of March, and has made many guest appearances in hit TV shows. He has also been extremely successful on Broadway, earning two Tony nominations. He is the son of Marilyn O’Connor, a family court judge of Irish descent.

Philip Seymor Hoffman brought a little bit of Hollywood to the Irish community of Woodlawn while filming "God's Pocket"