Amanda Peet Welcomes Son Henry

John Shearer/Invision for the Television Academy

It’s a boy for Amanda Peet.

The actress, 42, and David Benioff, 44, welcomed their third child, son Henry Peet Friedman, on Sunday, Dec. 7, in Los Angeles, her rep confirms to PEOPLE.

The new addition joins big sisters Molly June, 4½, and Frances Pen, 7½, at home.

“[My daughters] are very excited now,” she told PEOPLE in October. “We’ll see what happens when he actually arrives!”

Peet and her husband announced the pregnancy at the Emmys this fall, where Game of Thrones co-creator Benioff was up for 19 awards.

— Sarah Michaud with reporting by Julie Jordan