"Mad Men" actress January Jones still won't publicly reveal who her child's father is -- not even to the New York Times.
The 35-year-old, who plays ice queen mom Betty Draper on the ABC 1960s-themed show, has always remained mum about her love life. She never revealed the identity of her only son Xander's dad since she gave birth in September 2011.
"That's my son's business," she told the New York Times in a recent interview. "It's not the public's business."
The mystery about her son's paternity has spurred many celebrity and other news outlets to speculate who the dad may be. The newspaper cited how she has in the past been linked romantically to Matthew Vaughn, who is married and directed her in the 2011 film "X-Men: First Class." He has denied an affair. It also named co-star Michael Fassbender.
In September 2011, ABC News listed both in a top 5 list of "prime suspects for January Jones' Baby Daddy," along with "SNL" actor Jason Sudeikis, Food Network star Bobby Flay and married actor Xander Berkeley, who starred with Jones in the movie "Seeking Justice."
(Pictured above: January Jones talks to OTRC.com at the premiere of "Mad Men" season 6 in Los Angeles on March 20, 2013. Click the image to watch the video.)