January Jones chats with the New York Times about the latest season of Mad Men, and when the reporter tries to get her to open up about her personal life, she absolutely refuses.

When asked who fathered her 20-month-old son Xander, Jones snipes, "That's my son's business. It's not the public's business." The 35-year-old actress continued, "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.'"

“Women should have lots of secrets,” she added. “It’s our right to have secrets. Otherwise, what would we write in our memoirs?”

I guess it's not any of our business, but we're still dying to know!