The 31-year-old actress gave birth to a baby boy named Martin in August.
Leelee revealed that she was expecting in May with a noticeable baby bump at the Christian Dior Cruise 2015 fashion show in New York City.
Leelee and Adam are also parents to a four-year-old daughter named Louisanna Ray, who they call “Lewi.”
In case you missed it, Leelee showed off her post baby body at the 2014 Guggenheim International Gala Dinner last week in the Big Apple.
Congrats to the couple on their new bundle of joy!