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January Jones loves a good mystery.

The Mad Men star has never revealed the name of her one-and-a-half-year-old son Xander, and so she was asked yet again this week by the New York Times.

"That's my son's business," the 35-year-old actress says. "It's not the public's business." 

"Women should have lots of secrets," she adds.

Rumors have long swirled that the baby's father might be either X-Men: First Class director Matthew Vaughn or ex-boyfriend Jason Sudeikis.

For now, January is remaining tight-lipped, and it looks like we have a certain Oscar winner to thank for January's secretive outlook.

"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 explains.

But one thing January would reveal is her son's first word.

"His first word was 'Mama,'" she says of Xander. "His second was 'back,' cause I kept saying, 'Put it back.'" 

And so the mystery continues.

Source: New York Times