Poppy Montgomery and Shawn Sanford welcome a son! Credit: Gregg DeGuire/WireImage

It's a boy! Poppy Montgomery welcomed her third child, a baby boy named Gus Monroe Deveraux Sanford, on Tuesday, Nov. 11, her rep confirms to Us Weekly.

The Unforgettable star's little bundle of joy weighed 7 lbs., 4 oz., and measured 20.5 inches long. Gus joins Montgomery and her husband Shawn Sanford's 19-month-old daughter Violet Grace, as well as son Jackson, 6, from Montgomery's previous relationship.

The redheaded star revealed she was expecting during an interview with David Letterman back in July. "I'm expecting!" she told Letterman. "I’m far down the road of expecting…I'm six months pregnant. I've been hiding it until this very moment."

Sanford, a Microsoft executive, is also dad to daughter Haley and son Braydon from a previous marriage.