Alexis Bledel secretly welcomed son last year

19th Annual Screen Actors Guild (SAG) Awards held at the Shrine Auditorium - Arrivals Featuring: Alexis Bledel,Vincent Kartheiser Where: Los Angeles, California, USA When: 27 Jan 2013 Credit: FayesVision/

Actress Alexis Bledel secretly became first-time mum last year.

In November 2015, reports suggested the 34-year-old and her husband, actor Vincent Kartheiser of "Mad Men", were preparing to welcome their first child, but they never confirmed the rumours, and when the couple made its first public appearance following the reports at the Screen Actors Guild Awards in January, Alexis hit the red carpet without a visible baby bump.

Alexis then went to work on the upcoming Gilmore Girls revival in February, prompting fans to believe the baby news was just a gossip item.

But now her co-star Scott Patterson has let it slip in a new interview that the actress returned to set having already given birth to her first child late last year.

When asked what his experience was like to work with grown-up child star Alexis again, now she's an adult, Scott gushed, "She's really blossomed as a woman and now she's a proud new mother and married and happy.

"I remember her as an 18-year-old kid, fresh out of college, coming into Hollywood and being a little overwhelmed. She's just the most likeable, intelligent person and adorable human being. She hasn't changed at all. She looks the same."

He continued, "We're comparing notes because my son is about a year and a half older than her young son. I'm showing her photos and videos and what to expect. We're just really enjoying each other's company."

Scott, 57, became a first-time father to a baby boy in June 2014.

This isn't the first time the "Mad Men" stars have kept a major secret -- Alexis and Vincent wed in a private California ceremony in June 2014, but news of their marriage didn't surface until the following August.

The two actors began dating in 2012 and announced their engagement in 2013.