AceShowbiz -

Amanda Peet and her screenwriter husband David Benioff have just welcomed a new addition to their family. The actress gave birth to a baby boy on Sunday, December 7 in Los Angeles, Us Weekly reports.

It's the third child for the Jill St. Claire of "The Whole Nine Yards" and the "Game of Thrones" showrunner. The couple is already parents to 7-year-old Frances Pen "Frankie" and 4-year-old Molly June.

Peet debuted her growing baby bump on the red carpet of Primetime Emmy Awards in August after remaining mum about her pregnancy for months. She said in October about her third pregnancy, "It's great. I can't complain. I mean, I'm tired but otherwise, I'm doing really well."

Two days before giving birth to her son, Peet was still doing her regular activities. She was seen shopping with her daughter Molly in Beverly Hills. She went make-up free during the outing and wore a grey sweatshirt and navy tracksuit bottoms matched with a khaki parka jacket and a blue plaid scarf.

Peet will star on HBO's new comedy series "Togetherness" which is set to debut Sunday, January 11 at 9:30 P.M., after the new season premiere of "Girls".