If you're a fan of NBC's The Office, then you've been anticipating the birth of Pam and Jim's baby for a while. And last night, in Part 1 of two-part episode "The Delivery" Pam delivers a baby girl.

On the very same day, PEOPLE.com explains, Jenna's real life sister was also in labor, giving birth to Jenna's first niece, Cecelia, making Jenna a first time ABR (Auntie by Relation)! “Literally the day we shot Pam’s going to the hospital, my sister was going to the hospital, and the same day we shot me coming home from the hospital, my sister came home from the hospital. It was crazy! And so my dad [Jim] had one daughter going through it for real and another faking it.”

So how did Jenna honor her newborn niece? She convinced The Office writers to let Pam and Jim name their baby girl "Cecelia Marie Halpert." after her niece also named Cecelia.

And how does Jenna feel about becoming an Auntie? PEOPLE reports: “I get to see my sister about four times a year, probably,” she says. “I bet those trips will be more frequent because the baby is just so cute. She’s the cutest, sweetest little girl. I make my sister send pictures and videos every day. Maybe I’ll have to post a photo on my MySpace page so that everyone can know where the name came from!”

We hope you'll also share updates about your little niece here on SavvyAuntie.com, Auntie Jenna. Congratulations! You're a Celeb-Auntie!

To watch the full episode of when Pam becomes a mom (and Jenna becomes an aunt), click here.

Photo courtesy NBCU / TheOffice