LOS ANGELES, CA - JULY 10:  Prince William, Duke of Cambridge, helps his wife Catherine, Duchess of Cambridge in making hand prints in clay at Inner City Arts on July 10, 2011 in Los Angeles, California. The newly married Royal Couple are on the final day of their first joint overseas tour to the USA. They arrived on Friday after spending 9 days in Canada. The couple started off their tour of North America by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Phil Noble - Pool/Getty Images)