March 17, 2012 (18 images)

U.S. President Barack Obama toasts with Guinness beer while celebrating St. Patrick's day at the Dubliner Irish pub in Washington, DC, on March 17, 2012. UPI/Joshua Roberts/Pool

U.S. President Barack Obama celebrates St. Patrick's day at the Dubliner Irish pub with Ollie Hayes, (R) owner of a pub in Moneygall, Ireland and Henry Healy, Obama's cousin from Moneygall, Ireland in Washington, DC, on March 17, 2012. UPI/Joshua Roberts/Pool

Krys Freebes of Queens, NY, dresses for the occasion as she watches the 251st St. Patrick's Day Parade on March 17, 2012 in New York City. UPI/Monika Graff

Green water flows to celebrate St. Patrick's Day in the fountain on the South Lawn of the White House in Washington, DC, on March 17, 2012. UPI/Joshua Roberts/Pool