In private, Ms. Bruni-Sarkozy has no trouble making down-to-earth small talk: that Daniel Craig is good-looking but Sean Connery will go down as the best James Bond; how some of her friends have become paranoid that their phone conversations with her are monitored by French intelligence officers; how women over 25 — 28 at the latest — should stop wearing makeup because it ages them; how she longs to have a child with Mr. Sarkozy, but knows that at age 41, she is “just at the edge;” how she fell in love with Utah when she was once there on a shoot for Victoria’s Secret, modeling pajamas and boxer shorts because of her flat chest; how she still believed what she told an Italian interviewer years ago, that human beings cannot be faithful.