Michelle O. and Marc Jacobs in Dublin, Ireland...

 President Barack Obama and first lady Michelle Obama (wearing a Marc Jacobs dress) waved to the crowd at College Green in Dublin May 23, 2011. Obama is on a four-nation tour of Europe, which includes Britain, France and Poland.

US President Barack Obama greeted a young fan with First Lady Michelle during a public rally, in Dublin, Ireland, on May 23, 2011. US President Barack Obama landed in Ireland on May 23, 2011 for a visit celebrating his ancestral roots, kicking off a four-nation European tour.[photos via Getty Images and Reuters]