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Her mother, Maxine, is a secretary in Montreal and a fantastic cook. Her father, John Paul Sr., is a meat salesman and a sales & marketing executive in Canada. She has a twin sister, Jill Hennessy, who is an actress, and a younger brother, John Paul Jr. Her grandmother, Eleanor Hennessy, was a huge influence in her early life. She and husband Terry Moore welcomed the arrival of their first child, Mia Katherine Hennessy Moore, she weighed 8 pounds 11 ounces [5 February 2004] Writes articles for Canadian magazines. She and Jill played twin sisters on Dead Ringers. Twin sister of Jill Hennessy Once substituted for her sister as Claire Kincaid on Law & Order when Jill was out of town filming an "L&O" crossover episode for Homicide: Life on the Street. The two are so identical, viewers didn't notice the switch. Is currently a journalist and writer in Canada. Has a Master of Arts degree in French Literature. Sister-in-law of Paolo Mastropietro' .