These celebrities are proud parents - for the first, second, third or maybe even more times - following the births of their babies in 2015.
Let's look back at some of the year's most notable births!
Blake Lively and Ryan Reynolds
Blake Lively and Ryan Reynolds became parents for the first time to kick off the year in early January. Their daughter's name is James. She has good genes.
Kate Middleton and Prince William
Kate Middleton and Prince William welcomed a royal baby princess, Charlotte, on May 2! (Somehow Kate looks like this having given birth that day.)
Kim Kardashian and Kanye West
Kim Kardashian welcomed a baby boy toward the tail end of the year. A Saint, if you will. It's the second child for the reality star and husband Kanye West. Saint joins big sister North to round out the family.
Catelynn Lowell and Tyler Baltierra
Catelynn Lowell and Tyler Baltierra made this list first when they welcomed their second child on New Year's Day 2015. They're keeping this one, a daughter named Novalee Reign.
Justin Timberlake and Jessica Biel
Justin Timberlake and Jessica Biel welcomed their first child, a boy named Silas, in April 2015. The couple is as smitten with the little one as their fans are with the famous family.
Adam Brody and Leighton Meester
We have a feeling this child will be watching a lot of The OC and Gossip Girl as it gets older.