The White House turns green!
In Ireland, Guinness celebrates it's 250th year with a human shaped pint.
First Lady Michelle Obama wears green from head to toe, while touring an energy-efficient home construction project.
Parade goers look at the marching bands.
President Obama and Irish Prime Minister Brian Cowen take part in a shamrock ceremony.
You shouldn't have.
A young girl marches in NYC's parade.
Elephants from the the Ringling Bros. and Barnum and Bailey circus take part in Washington DC's parade.
London gets decked out.