It looks like the private princess training Kate Middleton has been undergoing is being put to good use. Today the Duchess of Cambridge and her husband, Prince William, visited the opening of the new Oak Center For Children and Young People at the Royal Marsden Hospital today. Kate has spent six months taking private lessons on government, the arts, and the media; even before her wedding, we heard she was was participating in royal training sessions meant to help her avoid the isolation Princess Diana felt after marrying into the royal family. The center the royal newlyweds went to today helps children and youths with cancer, and Kate isn't the first princess to be involved with the Royal Marsden Hospital, as Diana was a patron of the institution. See more photos of Will and Kate at the opening now.