William and Kate headed to LA tommorow as their North American trip winds down

Prince William and Catherine, the Duke and Duchess of Cambridge, kick off the last leg of their Canada tour today in Calgary. They are headed to the United States tomorrow for a three day stay in California.

Andrew Morton, celebrity biographer and author of "William & Catherine: Their Story," joins Kiran Chetry this morning to offer a royal insider's point of view into how the couple's trip has been so far and how their experience and behavior compares with that of Prince Charles and Princess Diana.