January Jones won't reveal the father of her son, Xander, telling the "New York Times Magazine," that's "my son's business, it's none of your business." Here are three guesses on the child's paternity.

January Jones gave birth to her son, Xander, in September of 2011. At the time, she wouldn't reveal the father of the son, and the Xander's paternity has remained a secret.

Recently, January Jones, was profiled by the New York Times Magazine and in the article, she told Ruth La Ferla about the identity of Xander's father:

"That's my son's business. [...] It's not the public's business."

January Jones, the 35-year-old beauty who stares on AMC's hit, Mad Men, as the scorned ex-wife of Don Drapper, Betty Draper, went on to add some advice she received from actor, Jack Nicholson, about the perils of fame and letting the media know too much about your personal life.

"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.'"

January Jones' secret about her son's paternity continues, and fans and celebrity watchers can only guess as to Xander's dad.

But January Jones had a bit of fun at all the speculation, telling the Times "Women should have lots of secrets. It's right to have secrets. Otherwise, what would we write in our memoirs?"

But January Jones has been linked to a bevy of men over the course of her film and television career, and has gotten a reputation for going after men who are already in committed relationships or even married.

Xander's father may be X-Men co-star, Michael Fassbender, who starred with Jones in the X-Men reboot, X-Men: The New Class around the time Xander was delivered in 2011. Jones played Emma Frost in the Marvel adaptation and Fassbender played the good and evil character of Magneto.

But Fassbender isn't the only possible father for Jones' Xander. "Seeking Justice" actor Xander Berkeley, or "Sweetwater" filmmaker Noah Miller have also been linked to the blond beauty, and it's obvious Xander might be in the running since he shares a first name with Jones' son.

January Jones' reputation for stealing men from their significant others was amped up even higher after January Jones was snapped getting into the car with Miley Cyrus' fiancé, Liam Hemsworth after the pair were flirting and reportedly "all over each other" during an Oscars After-Party earlier this year.

While Hemsworth is likely not be Xander's father, his affair with Jones was believed to be what put a hitch in his hitching to Miley Cyrus, even though the two insist they're still together and getting married.

With January Jones' son Xander, still without a father--at least to the public--gossip merchants and reports will continue to prod into her private life in an attempt to uncover just who Xander's father really might be.

Here's Jones talking her pregnancy while filming X-Men: First Class: