• Share
  • Tweet
  • Share
Leighton Meester, Blake Lively, Gossip Girl

The CW

Sure, Leighton Meester's daughter isn't even old enough to roll over yet, let alone pick out a perfect play date outfit, but no matter.

E! News confirmed that she and hubby Adam Brody recently welcomed their first child together and, naturally, Gossip Girl fans are over the moon about Blair Waldorf and Serena van der Woodsen finally being mommies at the same time.

Meaning, though Arlo Day Brody is not even two months old, she's already being squad-goaled into a BFFship with Blake Lively's daughter James. (In TV land—SPOILER ALERT—Meester and Lively's roles were reversed, with the season finale flash-forwarding to Blair and Chuck becoming parents to son Henry, while Serena future-tied the knot with Dan.)

 Blake Lively, Leighton Meester

Giovanni Rufino/The CW

Can't you just see it? Tea parties, playing dress-up, joint birthday parties, backstabbing each other out of the paste in pre-school... xoxo.

Take a look at the fans who just can't wait for the Blake-and-Leighton baby meet-up in a perfect world:

And so the rivalry begins.