Hargitay, who took daughter Amaya Josephine home just six months ago, told People magazine she and her husband are now parents of a son, Andrew Nicolas, who was born over the summer.
The 47-year-old "Law & Order: SVU" actress said she and her husband took Andrew home just one week after they had filed adoption paperwork.
"We never in a million years thought it would happen this quickly, but something inside of us knew that this was right, and we said, 'Yes, yes, yes!'" Hargitay told People.
Hargitay is also mother to a 5-year-old son.
Celebrity Families of 2014 [PHOTOS]
Reports: Mila Kunis gives birth to baby girl