Have you ever wondered which of your favorite celebrities have a wee bit (or even a whole lot) of Irish in them?

Actors Liam Neeson and Kenneth Branagh are not the only post 50s celebrities born in the Emerald Isle. We found quite a few -- as well as famous post 50s who have Irish ancestors.

In fact, one of the most famous Americans just learned he had Irish roots. In 2011, President Barack Obama took a trip to Moneygall, Ireland, after discovering that his great-great-great-grandfather, Fulmoth Kearney, once called Moneygall his home.

To honor those of Irish descent, President Obama has declared the month of March Irish-American Heritage Month. So check out the slideshow below to see which celebrities share his Irish heritage, and vote for your favorite!

Loading Slideshow...
  • Kenneth Branagh

    Actor, <a href="http://www.biography.com/people/kenneth-branagh-9224181" target="_hplink">Kenneth Branagh</a>, of Belfast, Northern Ireland, born 1960.

  • Alec Baldwin

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000285/bio" target="_hplink">Alec Baldwin</a>, born 1958.

  • Liam Neeson

    Actor, <a href="http://www.biography.com/people/liam-neeson-9421118" target="_hplink">Liam Neeson</a>, of Ballymena, Northern Ireland, born 1952.

  • Enya

    Singer <a href="http://www.enya.com/about_bio.php" target="_hplink">Enya</a> was born Eithne Ní Bhraonáin in Gweedore, Donegal, Ireland, 1961.

  • Pierce Brosnan

    Actor, <a href="http://www.imdb.com/name/nm0000112/bio" target="_hplink">Pierce Brosnan</a>, of Navan, County Meath, Ireland, born 1953.

  • George Clooney

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000123/bio" target="_hplink">George Clooney</a>, born 1961.

  • Mel Gibson

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000154/bio" target="_hplink">Mel Gibson</a>, born 1956.

  • Bill Maher

    Irish-American comedian, <a href="http://www.imdb.com/name/nm0005175/bio" target="_hplink">Bill Maher</a>, born 1956.

  • Bono

    U2 frontman, <a href="http://www.biography.com/people/bono-16257407" target="_hplink">Bono</a>, of Dublin, Ireland, born 1960.

  • Bill Murray

    Irish American actor, <a href="http://www.imdb.com/name/nm0000195/bio" target="_hplink">Bill Murray</a>, born 1950.

  • Diane Keaton

    Irish-American actress, <a href="http://www.imdb.com/name/nm0000473/bio" target="_hplink">Diane Keaton</a>, born 1946.

  • Harrison Ford

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000148/bio" target="_hplink">Harrison Ford</a>, born 1942.

  • Sean Penn

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000576/bio" target="_hplink">Sean Penn</a>, born 1960.

  • Denis Leary

    Irish-American comedian, <a href="http://www.imdb.com/name/nm0001459/bio" target="_hplink">Denis Leary</a>, born 1957.

  • Van Morrison

    Musician, <a href="http://www.biography.com/people/van-morrison-9415616" target="_hplink">Van Morrison</a>, of Belfast, Northern Ireland, born 1945.

  • Gabriel Byrne

    Actor <a href="http://www.biography.com/people/gabriel-byrne-215218" target="_hplink">Gabriel Byrne</a>, of Dublin, Ireland, born 1950.

  • Rosie O'Donnell

    Irish-American actress, Rosie O'Donnell, born 1962.

  • John Travolta

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000237/bio" target="_hplink">John Travolta</a>, born 1954.

  • Ron Howard

    Irish-American director, <a href="http://www.biography.com/people/ron-howard-9542185" target="_hplink">Ron Howard</a>, born 1954.

  • Regis Philbin

    Irish-American actor, <a href="http://www.biography.com/people/regis-philbin-9542101" target="_hplink">Regis Philbin</a>, born 1931.

  • Kathy Bates

    Irish-American actress, <a href="http://www.imdb.com/name/nm0000870/bio" target="_hplink">Kathy Bates</a>, born 1948.

  • Kevin Costner

    Irish-American actor, <a href="http://www.imdb.com/name/nm0000126/bio" target="_hplink">Kevin Costner</a>, born 1955.

  • Peter O'Toole

    Actor <a href="http://www.biography.com/people/peter-otoole-9430474" target="_hplink">Peter O'Toole</a>, of Connemara, County Galway, Ireland, born 1932.