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The two of them live (with a dachshund they call Wiedellini) in a handsome old brick structure in Manhattan's chic Tribeca district. They both plan to work, and they are not quite sure how to arrange this. Isabella, musing on the subject, pointed out that planning a pregnancy this year shows that "my sense of identity isn't bound up with my career." She paused: "Americans tend to be like greyhounds, running all the time. I enjoy being in the race too, but suddenly I'm struck by the sun and decide, if I've got enough money, to do nothing for six months. That's very European. I don't fear the loss of success." —By John Skow. Reported by Elaine Dutka/New York