It's St. Patrick's Day, which means it's time to take a look at the Sexiest Irish Celebrities in Hollywood.  Here are our favorites . . .


Michael Fassbender.  He was in this year's Oscar darling "12 Years a Slave".


Chris O'Dowd.  He gave it to Kristen Wiig in "Bridesmaids".


Olivia Wilde.  She has dual U.S. and Irish citizenship.  Her last name is also a tribute to Irish author Oscar Wilde.  Her REAL last name is the far sexier COCKBURN.


Jamie Dornan.  He's Christian Grey in the upcoming "Fifty Shades of Grey" movie.


Kristen Bell.  She gets very emotional when a sloth is near. 


Vanessa Hudgens.  She's one-quarter Irish.  She also has Spanish, Chinese, Native American and Filipino in her.


Colin Farrell.  Like he wouldn't be on this list.


Gerard Butler


George Clooney.  He's only half.


Alicia Keys.  She's also African-American, Italian and Scottish.


President Obama.  His great-great grandfather was born in Ireland.


Matthew McConaughey


Lindsay Lohan.  You'd think there'd be more GINGERS on this list.

Speaking of gingers . . . Conan O'Brien also made the list.


Heather Graham


Robert Downey Jr.


The Jonas Brothers.  They also have Cherokee, Italian and German blood mixed in.


Luke and Owen Wilson




John Stamos.  He may look 100% Greek, but he's half Irish.


Pierce Brosnan


Liam Neeson


(Check out a list of 60 Irish celebs here.)