The world is still wondering who January Jones' baby daddy is -- and it looks like we'll all have to keep wondering.

Jones told The New York Times, "That's my son’s business. It's not the public’s business."

Apparently the 'Mad Men' actress got advice to stay mum on being a mum from none other than Jack Nicholson. "[He] once told me: 'You should never give your personal life away, otherwise people will pick you apart. They’ll never believe in your character,'" she said.

"Women should have lots of secrets. It's our right to have secrets," Jones continued of her efforts to maintain her mystique. "Otherwise, what would we write in our memoirs?"

We dunno. Maybe something about Liam Hemsworth?

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