Nick and Vanessa Lachey are proud parents once again.

The celebrity couple announced on social media that their third child, a baby boy named Phoenix, was born on Christmas Eve.

"It's a very Merry Christmas indeed!" Vanessa wrote in an Instagram post. "We had our Christmas Miracle. Phoenix Robert Lachey decided to show up early and was born on Christmas Eve. Mommy, Daddy, Camden & Brooklyn LOVE You very much! #LacheyPartyOf5"

Phoenix joins brother Camden, 4, and sister Brooklyn, who will be turning two years old in January.

The couple first announced Vanessa's pregnancy on social media in September. The revelation was soon followed-up with the news that the baby would be a boy after the couple posted a video of Camden handing his father a baby blue balloon.

20 Celebrity Co-Stars Who Fell In Love Behind the Scenes

More From 99.9 KTDY