The White House posted a photo:

President Barack Obama and President Felipe Calderón of Mexico stand together during the playing of the national anthem on the South Lawn of the White House, May 19, 2010. (Official White House Photo by Pete Souza)
This official White House photograph is being made available only for publication by news organizations and/or for personal use printing by the subject(s) of the photograph. The photograph may not be manipulated in any way and may not be used in commercial or political materials, advertisements, emails, products, promotions that in any way suggests approval or endorsement of the President, the First Family, or the White House.