Graydon Carter; Keira Knightley; Serena Williams

Graydon Carter, editor of Vanity Fair, talks about the 25th anniversary of the magazine and his book of photographs from the magazine archives, "Vanity Fair, A Century of Iconic Images." Actor Keira Knightley discusses her film "The Duchess," based on the life of Georgiana, Duchess of Devonshire. Tennis champion Serena Williams reflects on her record summer, the influence of her sister and parents, and her plans for off the court.