Prince William, the Duke of Cambridge, left, and U.S. President Barack Obama meet in the Oval Office of the White House in Washington, D.C., U.S., on Monday, Dec. 8, 2014. Obama welcomed Prince William for his first visit to the White House to thank the Duke of Cambridge for the British royal family's hospitality during presidential visits to the U.K. and to underscore "the special relationship between the United States and the United Kingdom," the White House said in announcing the visit. Photographer: Andrew Harrer/Bloomberg via Getty Images