In the case of January Jones' sealed lips about her baby father, life is imitating art.

The actress seems to be acting just as cold as her "Mad Men" character, Betty Draper when it comes to giving up the paternity goods. She will not let the cat out of the bag on just who fathered her 20-month-old son, Xander Dane Jones, according to USA Today. 

So let the speculation continue!

Word on the street was that her ex, Jason Sudeikis, "X-Men:First Class" director Matthew Vaughn and co-star Michael Fassbender, and even Miley Cyrus' fiancee, Liam Hemsworth could be possible y's that match her x. But whoever it may be, Jones just will not cough up an answer.

"That's my son's business," she said to the New York Times. "It's not the public's business." 

And the actress, who will not appear in the upcoming "X-Men: Days of Future Past" film despite rumors, got some sound advice from a veteran actor, according to the Los Angeles Times.  "Jack Nicholoson once told me,'You should never give your personal life away. Otherwise, people will pick you apart.They'll never believe you in your character.'"

Jones is becoming known for being guarded, and she proves it again in taking a "mums the word" approach. She even professed that women should have lots of secrets to the New York Times. But again, her "keep quiet" mentality when it comes to her baby does not beat when she ate his placenta after his birth to stave off postpartum depression. She said that experience was like "taking a vitamin blended into a smoothie."

Wow. Sound off below!