Celebrities attend White House Correspondents' Association Dinner

Singer Colton Dixon arrives on the red carpet for the annual White House Correspondents' Association Dinner at the Washington Hilton in Washington, April 28, 2012. [Photo/Agencies]

Journalist Charlie Rose (L) greets Chris Matthews (R) and his wife Kathleen Matthews as they arrive for the annual White House Correspondents' Association Dinner at the Washington Hilton in Washington, April 28, 2012. [Photo/Agencies]