To celebrate the special occasion, the family kicked things off by visiting Santa Claus.
Biel and Timberlake recently took their adorable bundle of joy to The Grove in Los Angeles to sit on Santa's lap. Although it's unclear if Silas was able to ask Santa for presents, since he's still probably a little too young for coherent speech.
The family arrived to the iconic shopping mall with their own private security, heading straight to the Santa House and then leaving immediately after their scheduled time with St. Nick. "Justin was sweet with Silas," an eyewitness tells ET.
Timberlake gushed about his little boy-- and even showed off adorable pics! --when he sat down with Jimmy Fallon on The Tonight Show in September, where the 34-year-old "Suit & Tie" singer said that fatherhood is "the most insanely amazing, wonderful, unbelievable thing to ever happen to you."
In October, the loving parents admitted during a speech they gave at the Gay, Lesbian and Straight Education Network's Respect Awards, that they are still getting the hang of parenting.
"My beautiful wife and I are a couple of new parents. We're not very good at it yet," Timberlake joked during his speech.
Well, it seems like they sure have a good idea on how to give their baby a memorable yuletide! And we hope they happy parents post some cute Christmas pics of Silas, because the world needs more photos of babies decked out for the holidays.