Jessica Alba rang in 2018 in an incredibly special way: with another addition to her family.

On New Year's Day, the actress and entrepreneur announced on Instagram that she and husband Cash Warren welcomed their third child—their first son—on December 31, 2017. The baby's name, she revealed, is Hayes Alba Warren (his two sisters' names also begin with Hs).

Alba posted a photo of Hayes on Instagram, along with a sweet message. "Best gift to ring in the New Year!! Cash and I feel so blessed. Haven and Honor are already obsessed with their new baby bro. 👶🏽💙 #familyof5," she wrote.

Warren posted a sweet picture to his Instagram account, too, of him holding Hayes. He captioned it: "Hayes Alba Warren: You sure know how to ring in the new year! You showed up a few days early but we couldn’t be any happier. Your Mamma is the strongest woman I know ... you’re so lucky to have her by your side. You have two amazing sisters who already adore you and I know you’ll be thankful to have them guide the way. On your first day of life, I promise to love you, to cherish you, and to provide you with a sandbox full of dreams to explore. Welcome to the family my sweet baby Hayes!"

Alba announced her pregnancy in July, with a Boomerang featuring daughters Honor and Haven, each holding a balloons in the shape of a"1" and a "2," respectively; their mom was holding one in the shape of a "3". She explained in the caption: "@cash_warren and I are officially going to be outnumbered #babyonboard #herewegoagain 👶🏼🤰🏽#blessed🙏."

Related: America Ferrera Is Expecting Her First Child

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