January Jones not naming child's father

January Jones not naming child's father'Mad Men" star January Jones is remaining mum on the identity of the father of her son, Xander, 20 months. "That's my son's business," she told The New York Times. "It's not the public's business." She went on to explain, "Jack Nicholson once told me: 'You should never give your personal life away, otherwise people will pick you apart. They'll never believe in your character.' " Jones, 35, whose past paramours include Jason Sudeikis, Ashton Kutcher and Josh Groban, added, "It's our right to have secrets. Otherwise, what would we write in our memoirs?"