​Leighton Meester and Adam Brody are the latest to join the New Celebrity Parents club. The notoriously media shy couple couple have just welcomed their first child, a source confirms to Us Weekly

TMZ reports the baby was actually born over a month ago on August 4 and is a girl named Arlo Day, according to her birth certificate.

It's exciting news for all of us—especially Blake Lively's baby, James. Just imagine the future playdates—​and Gossip Girl marathons.

Congratulations to the couple!

Words Alyssa Bailey

From: ELLE.com