Ok so we all have some favourite American actors or actresses but dd you know the majority of them are irish?

Here is a list of who's half irish (you won't beleive who's half irish)

1990s
Abigail Breslin (1996 - )
Spencer Breslin (1992 - )
Miranda Cosgrove (1993 - ) Television actress iCarly
Dakota Fanning (1994 - )
Patrick Kelley (1994 - ) Television actor (Heroes)
Jennette McCurdy (1992 - ) Television actress iCarly
Nick Jonas (1992 - ) member of Jonas Brothers and actor on Disney Channel Original Series JONAS and Camp Rock
Demi Lovato (1992 - ) Television actress (Disney Channel Original Movie Camp Rock and Sonny with a Chance) and musician
Erik Per Sullivan (1991 - )
AnnaSophia Robb (1993 - )
[edit] 1980s
Vanessa Hudgens (1988 - ) film/television actress (High School Musical trilogy)
Joe Jonas (1989 - ) member of Jonas Brothers and actor on Disney Channel Original Series JONAS and Camp Rock
Kevin Jonas (1987 - ) member of Jonas Brothers and actor on Disney Channel Original Series JONAS and Camp Rock
Megan Fox (1986 - ) film/television actress and model (Transformers (film) Transformers: Revenge of the Fallen and television series Hope and Faith)
James Lafferty (1985 - ) film/television actor (One Tree Hill (TV series))
Jessica Sutta (1982 - ) dancer/singer/actress (Pussycat Dolls)
Chad Michael Murray (1981 - ) film/television actor (One Tree Hill (TV series))
Mischa Barton (1986 - ) film/television actress (The O.C.)[1]
Kristen Bell(1980- ) tv actress, stars in Veronica Mars
Lauren Conrad, fashion designer and reality tv star of MTV's Laguna Beach: The Real Orange County and The Hills (Irish/German ancestry)
Kieran Culkin
Macaulay Culkin [2]
Rory Culkin
Chris Evans (1981 - ) film actor ("Cellular", "Fantastic Four")[3]
David Gallagher (1985 - ) actor, perhaps best known for his role of Simon Camden on the television series 7th Heaven[4]
Anne Hathaway (1982 - ) film actress ("The Princess Diaries", "The Devil Wears Prada")[5]
Scarlett Keegan (1984 - ) model and actress; Playboy Playmate[6]
Tessa Keller, (1989- )model and reality tv star on Laguna Beach: The Real Orange County
Lindsay Lohan (1986 - ) teen idol/pop singer/actress, her mother Dina (née Sullivan) is Irish-American[7]
Michelle Lombardo (1983 - ) actress and model[8]
AnnaLynne McCord, actress on 90210
Mandy Moore, singer and actress (father of Irish extraction)
Heidi Montag, reality star of MTV series The Hills (Irish/German ancestry)
Renee Olstead (1989-) actress/singer
Olivia Wilde, (1984 - ) actress/writer. Plays Thirteen on the TV series House, M.D.
Elijah Wood (1981 - )
[edit] 1970s
Vince Vaughn (1970 - )
Renée O'Connor (1971 - ) TV, Film & Stage Actor/Director/Producer. Best known as the co-star of the six year TV series "Xena Warrior Princess"
Ben Affleck (1972 - ) Hollywood film star/screenwriter[9]
Casey Affleck
Drew Barrymore (Father John Drew Barrymore)
Lara Flynn Boyle [10]
A.J. Buckley
Eddie Cahill [11]
Jennifer Connelly [12]
Kevin Connolly
Dane Cook (1972 - ) actor/comedian
Shannen Doherty (1971 - ) film/television actress
Jimmy Fallon (1974 - ) actor/comedian [157] ""I'm Irish, so I mean, please," gripes Fallon. "They should never stop selling alcohol in general."
Heather Graham [13]
Alyson Hannigan (1974 - ) film/television actress ("Buffy the Vampire Slayer", "American Pie")[14]
Josh Hartnett (1978 - ) film actor ("40 Days and 40 Nights", "Sin City")
Katherine Heigl [15]
Ashton Kutcher (1978 - ) film/television actor/prankster (That '70s Show)[16]
Jenny McCarthy [17]
Ana Ortiz
Rose McGowan [18]
Danica McKellar, part Irish through her father.
Bridget Moynahan [19]
Charlie O'Connell [20]
Jerry O'Connell [20]
Chris O'Donnell [21]
Monica Potter [22]
Dominic Purcell [23]
Robin Tunney [24]
Mark Wahlberg [25]
Paul Walker [26]
Sean Astin
[edit] 1960s
Sean Penn (1960 - ) his mother was a Catholic of Irish descent
Chris Penn (1965 - 2006) his mother was a Catholic of Irish descent
Robert Downey Jr (1965 - ) his father is of Irish descent
Daniel Baldwin (1960 - ) actor, producer and director, one of the Baldwin brothers[27] his father is of Irish decent
Stephen Baldwin (1966 - ) actor, one of the Baldwin brothers[27] his father is of Irish descent
William Baldwin (1963 - ) film actor, one of the Baldwin brothers[27] his father is of Irish descent
Matthew Broderick [28]
Edward Burns [29]
James Caviezel, his mother is of Irish descent [30]
Neil Flynn film and television actor. Noted for his role as "Janitor" in Scrubs.
George Clooney (1961 - ) Academy Award-winning actor, director, producer and screenwriter[31]
Courteney Cox Arquette actress, film producer, and former model. Has German and Irish descents, mostly Irish.
Stephen Colbert (1964 - ) actor, comedian, and journalist. Despite French surname, is of mostly Irish descent.
John Cusack [32]
Patrick Dempsey (1966 - ) film and television actor (Grey's Anatomy)[31]
Johnny Depp (1963 - ) Academy Award-nominated American actor, former teen idol
Matt Dillon (1964 - ) Academy Award-nominated American actor, former teen idol[31]
Karen Duffy [33]
Dean Winters
Chris Farley[34]
Brendan Fraser [35]
Janeane Garofalo, is half-Irish, half-Italian[36]
Lauren Graham [37]
Kathy Griffin [38]
Bonnie Hunt (1961 - ) actress
Lucy Lawless (1968 - ) Full name:Lucille Frances Ryan Lawless Tapert. Actor best know for the co-starring role in the six year TV series "Xena Warrior Princess"in which she played Xena. Her great grandfather was from from Quilt in Co. Clare Ireland.
Anthony Michael Hall (1968 - ) film/television actor, former teen star[39]
Bonnie Hunt [40]
Thomas Jane, actor, The Punisher [41]
Moira Kelly [42]
Robert Kelly [43]
Matthew McConaughey (1969 - ) Actor
James McCaffrey [44]
Dylan McDermott [45]
Neal McDonough [46]
Edward Norton, (1969 - ), actor, known for movies like American History X and Fight Club.
Rosie O'Donnell [47]
Mike O'Malley [48]
Tatum O'Neal, Youngest actor to won an Oscar
Ellen Pompeo, is half-Irish, half-Italian actress
John C. Reilly [49]
Molly Shannon [50]
Christian Slater, Irish, English extraction
John Stamos, his mother, Loretta Phillips Stamos, is an immigrant from Ireland.
Ben Stiller [51]
Julia Sweeney [52]
Maura Tierney [53]
Courtney Thorne-Smith [54]
Donnie Wahlberg [55]
Kate Walsh (1967 - ) actress/television
Luke Wilson (brother of Owen Wilson)
Owen Wilson [56]
Tom Cruise (1962 - )
Paul Giamatti (1967 - )
[edit] 1950s
Kevin Bacon
Baldwin brothers, father is of Irish heritage
Steve Buscemi [57]
Gabriel Byrne (1950 - ) Irish-born; Emmy- and Tony-nominated actor, and star of the 1995 film, The Usual Suspects
Lenny Clarke [58]
David Caruso actor, (Mother is Irish-American, Father is Italian-American)
Kevin Costner, celebrity actor, of Native American, Irish and German descent [59]
Tim Daly (1956 - ) stage, television and film actor, producer and director
Bo Derek [60]
Janice Dickinson, model, reality television star, her father is of Irish heritage
Peter Gallagher
Mel Gibson (1956 - ) actor, director and producer, his mother is an immigrant from Ireland
Patricia Heaton [61]
Marg Helgenberger[62]
Nathan Lane [63]
Denis Leary [64]
Bill Maher [65]
Mary McDonnell Twice nominated for the Academy Award
Kelly McGillis[66]
John C. McGinley [67]
Ted McGinley (John C. McGinley's cousin—see also "Jump the Shark")
Kate Mulgrew [68] (1955- ) Best known for her role as Captain Kathryn Janeway and Mary Ryan on the soap Ryan's Hope, about an Irish-American family
Bill Murray (1950 - ) Academy Award-nominated, Emmy-winning and Golden Globe-winning comedian and actor[69]
Michael O'Keefe [70]
Colin Quinn [71]
Mickey Rourke [72]
John Sayles (1950 - ) independent film director and writer, frequently takes a small part in his own and other indie films[73]
John Travolta Is of Irish-Italian ancestry [74]
[edit] 1940s
Armand Assante (1949 - ) film actor[75]
Gary Busey [76]
Bud Cort [77]
Mia Farrow [78]
Harrison Ford paternal grandfather was Irish-American [79]
Teri Garr [80]
Richard Gere Celebrity Actor, [81]
Dennis Holahan (1942 - ) actor
Diane Keaton [82]
Kevin Kline [83]
Michael Moriarty [84]
Ryan O'Neal [85]
Martin Sheen His mother was an immigrant from Ireland [86]
Suzanne Somers [87]
Meryl Streep, actress, mother is of partial Irish decent
[edit] 1930s
Stephen Boyd [88]
Peter Boyle [89]
Eileen Brennan [90]
George Carlin (1937 - 2008)
[91]

Brian Dennehy (1938 - ) film/television/stage character actor[92]
Clint Eastwood (1930 - ) [93]
Malachy McCourt [94]
Jack Nicholson [158] On Nicholson's maternal grandparents: "She began as Ethel May Rhoads of Chester, Pennsylvania, only daughter of upright Pennsylvania Dutch Protestants, and when she married John Nicholson, a working class Irish Catholic, her irate family broke their ties and disinherited her."</ref>
Mike Farrell (See his biography "Just Call Me Mike")
Bernie McInerney: (1936 - ) is a film/television/stage character actor
Roy Scheider (1932 - 2008)
James Earl Jones (1931 - )
[edit] 1920s
Steve Allen [95]
Jack Cassidy [96]
Rosemary Clooney [97]
Judy Garland (1922-1969)- see article [98]
Grace Kelly [99]
Patrick McGoohan {See article}
Anne Meara (1929 - ) comedienne and actress, partner and wife of Jerry Stiller[100]
Carroll O'Connor [101]
Donald O'Connor [102]
Maureen O'Hara [103]
Jason Robards [104]
Eileen Ryan [105]
Maureen Stapleton (1925-2006), Oscar-winning film/stage/television actress[106]
Marlon Brando (1924 - 2004)
Gene Tierney (1920 - 1991), stage/film actress
Jack Lord (1920-1998), film/stage/television actor[107]
[edit] 1910s
Rita Hayworth {1918-1987}-see article, her mother, showgirl Volga Hayworth, was Irish-American
Lucille Ball {1911-1989}-see article
Arthur Kennedy {1914-1990}
Art Carney {1918-2003}[108]
Geraldine Fitzgerald [109]
Jackie Gleason {1916-1987}[110]
Gene Kelly [111]
Edmond O'Brien [112]
Virginia O'Brien [113]
Gregory Peck [114]
Tyrone Power [115]
Anthony Quinn [116]
Ronald Reagan (1911 - 2004) Before entering politics, Reagan was a popular motion picture actor, as well as head of the Screen Actors Guild, a television actor, an announcer for the Chicago Cubs, and a motivational speaker[117]
[edit] 1900s
Joan Crawford {1903-1977} - her maternal grandmother was Irish
Bing Crosby {1903-1977} - mother was of Irish descent. [118]
James Dunn {1905-1967}[119]
Errol Flynn {1909-1959}[120]
Eddie Foy Jr. {1905-1983}-see article
Helen Hayes {1900-1993}[121]
John Huston {1906-1987} [122]
Spencer Tracy (1900-1967)[123]
John Wayne {1907-1979}
Lon Chaney Jr. {1906-1973}
[edit] 1890s
Gracie Allen (1895 - 1964) actress, comedian who became internationally famous as the zany partner of husband George Burns[124]
Ada Dyas
James Cagney {1899-1986}[125]
Buster Keaton {1895-1966}[126]
Pat O'Brien {1899-1983} [127]
Walter Brennan {1884-1974}
[edit] 1880s
Lon Chaney Sr. {1883-1930}
[edit] 1870s
Sara Allgood (1879 - 1950) Oscar-nominated Irish-born actress[128]
George M. Cohan {1878-1942}