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It's a Boy!Nick Lachey and Vanessa Lachey Welcome Baby No. 3 — Find out Their Son’s Unique Name!

Lachey, party of five!

Nick Lachey and Vanessa Lachey announced on Monday, Dec. 26 that they welcomed their third child, a baby boy named Phoenix Robert Lachey, on Christmas Eve.

MUST SEE: Vanessa Lachey Shares an Adorable New Photo of Son Camden — Plus See More of Hollywood's Cutest Kids!

“It's a very Merry Christmas indeed! We had our Christmas Miracle. Phoenix Robert Lachey decided to show up early and was born on Christmas Eve. Mommy, Daddy, Camden and Brooklyn love you very much!” the proud mom wrote next to an Instagram photo of her newborn son’s hand grasping her fingers.

The couple — who also share four-year-old son Camden and daughter Brooklyn, 23 months — announced the pregnancy back in September.

MUST SEE: Nick Lachey Remembers the Moment He and Wife Vanessa Became Parents!

“We got a new crib! Now we need a new CRIB. Newest Lachey arriving Spring 2017,” Nick posted, along with a pic of his beautiful family.

Vanessa later announced that they were expecting a boy after surprising her hubby with an array of blue balloons in their home.

"I have so much to be thankful for this year, especially our littlest Lachey. When Daddy came home from tour this summer and we were moving into our new house I shared the news! Now I'm sharing it with you!” the 36-year-old brunette beauty said at the time.

“I am so very thankful and grateful for this family of mine! And thankful for YOU! All your love and support makes what we do FUN and worth it!" she added.

MORE: Pregnant Molly Sims Shows off Her Growing Baby Bump While Decorating the Christmas Tree — See the Pic!

Nick, 43, has been known to gush about fatherhood. “It’s just all-encompassing. You would do anything for your children — not that you wouldn’t for your wife or someone else you love, but there’s a sense of protectiveness and responsibility that comes with your child, which you don’t feel in any other relationship,” he previously admitted. “[Becoming a dad] has changed my life in every possible way.”

Click through the gallery below to see more celebrity babies born in 2016!