David Walton and Majandra Delfino welcome a new baby. Credit: Jason LaVeris/FilmMagic

A welcome surprise! 

Actors David Walton and Majandra Delfino told Us Weekly that they welcomed their second child -- son Louis Augustus Walton -- on Nov. 10, a month before he was due to arrive. 

The healthy baby weighs 8 pounds and 7 ounces. 

"Louis is as healthy as can be. We couldn't be happier with our very early Christmas gift," Walton said.

Walton recently starred as Jess Day's boyfriend on Fox's New Girl and is set to star in NBC's mid-season show About a Boy. 

Delfino is best known for her role as Maria DeLuca on Roswell and will star in CBS' mid-season show Friends With Better Lives.