Members of the plumbers' union dye the Chicago River green for St. Patrick's Day on March 17, 2012. The river was first dyed green in 1962 in what has become a St. Patrick's Day tradition in Chicago.
Men in traditional Irish dress watch the 251st annual St. Patrick's Day Parade in New York City. The parade honors the patron saint of Ireland and was held for the first time in New York on March 17, 1762, 14 years before the signing of the Declaration of Independence.
Children watch the parade in New York City.
A marching band passes St. Patrick's Cathedral.
The Irish Dancing Music Association takes part in the parade.
Paradegoers watch the St. Patrick's Day festivities in Dublin on March 17, 2012. More than 100 parades are being held across Ireland to mark St. Patrick's Day, with up to 650,000 spectators expected to attend the parade in Dublin.
A patch of white clover grows on a lawn next to the St. Patrick's Day parade route in Owensboro, Ky. on Friday.
Krys Freebes watches the 251st St Patrick's Day Parade on 5th Avenue.
President Barack Obama visits a bar in celebration of St. Patrick's day at the Dubliner Restaurant and Pub. Next week, Obama and Vice President Biden will meet the Irish Prime Minister Enda Kenny and attend a St. Patrick's Day lunch at the Capitol.
A colorful dance is performed during the St. Patrick's Day festivities in Dublin.
All smiles despite a bit of rain, paradegoers make their way through the streets of Armagh.
A child smiles as he watches a parade in Dubin.
Paradegoers, almost all decked out in something green, shout as they watch the festivities in Dublin.
A performer takes part in the festivities in Dublin.
A man in religious wear takes part in a parade in Dublin.
Catherine, Duchess of Cambridge, presents a basket of shamrock sprigs to the Irish Guards army regiment during a St. Patrick's Day ceremony at their barracks in Aldershot, England.
Musicians perform as they take part in a St. Patrick's Day Parade in Arbat Street in downtown Moscow.
A leprechaun takes part in the St. Patrick's Day parade in Armagh, Northern Ireland.
A paradegoer watches a float during the festivities in Dublin.
Lily Hoagland and Seth Frey, both 5, prepare to lead the parade Friday morning during the Our Lady of Lourdes Catholic Church Daycare Center's 22nd annual St. Patrick's Day parade. Lily was chosen Miss Ireland and Seth was selected as Mr. Ireland. The students decorated the wagons and oversized stollers to march through the parking lot and through the halls of Owensboro Catholic K-3 Campus.
The Sky Tower in Auckland is illuminated in green, joining the Opera House in Sydney and Table Mountain in Cape Town in going green to celebrate St. Patrick's Day.
Dan Gavigan, an employee of New Berlin-based Beechwood Sales and Service, makes a beer delivery to the Blue Rock Lounge in Racine, Wis., on Friday afternoon in preparation for St. Patrick's Day.