BEVERLY HILLS, CA - JULY 10:  Catherine, Duchess of Cambridge smiles during a reception to mark the launch of Tusk's US Patron Circle at the home of Steve Tisch on July 10, 2011 in Beverley Hill, 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 Karen Ballard - Pool/Getty Images)