2018 is off to a promising start!
The former Dark Angel star announced her exciting news via Instagram, posting a photo of their precious bundle of joy.
"Hayes Alba Warren 12/31/17 Best gift to ring in the New Year!!" the mum-of-three captioned the photo.
"Cash and I feel so blessed. Haven and Honor are already obsessed with their new baby bro," the 36-year-old gushed.
Hayes looks absolutely adorable, just look at that gorgeous head of hair on him! Also, his name matches his sisters' perfectly.
He's the first baby boy in the family-of-five, joining big sisters Haven, 6, and Honor, 9.
Proud papa Cash also shared a photo of Hayes on Instagram.
The 38-year-old lovingly wrote to his son, "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."
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! 12/31/2017
Fans took to the comments to congratulate the actress.
One follower said, "Congratulations! Here is to a wonderful fresh year!"
"Massive congratulations to you both, he's gorgeous," wrote another.
Congrats to Jessica and Cash on their growing family! And welcome to the world, baby Hayes!