James Van Der Beek and Wife Welcome Fourth Child

— -- James Van Der Beek's family just got a little bit bigger.

The "CSI: Cyber" actor and his wife Kimberly welcomed their fourth child, Emilia, on Wednesday. The actor announced the news two days later on his social media accounts, gushing about his newborn.

"Crazy how deeply in love you can fall with someone you just met," he tweeted Friday.

Baby Emilia joins Van Der Beek's other children: Olivia, 5, Joshua, 4, and Annabel, 2.

The Van Der Beek family has been celebrating all week. The actor's wife Kimberly turned 34 on Tuesday -- one day before she gave birth.

Van Der Beek, 39, wished his wife of six years a happy birthday on Twitter, writing: "Wishing a very happy birthday to the coolest thing about me."