“Happy to say #MarchMadness looks a little different this year for me. #GoBearcats,” the father-of-three, 43, captioned the image cuddling his newborn.
Nick and Vanessa welcomed their third child on December 24, they announced on social media.
“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 & Brooklyn LOVE You very much! #LacheyPartyOf5,” Vanessa wrote.
The high-profile couple are also parents to son Camden, 4, and 2-year-old daughter Brooklyn.
?My Phoenix? A post shared by Vanessa Lachey (@vanessalachey) on