The new mommy shared the news of her little bundle of joy's arrival on Instagram.
"Marco and I are elated to share the news of the birth of our son Zen. We couldn't feel more blessed with the new addition to our family. #threeboys... Oh boy," Saldana wrote alongside the picture of her three kids.
The couple is already parents to twin sons Cy Aridio and Bowie Ezio, who turned 2 in November.
Saldana, 38, and Perego, 37, tied the knot in 2013 after three months of dating.
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