We're surprised she left town in the first place!

Kourtney Kardashian rushed back from NYC yesterday to meet sister Kylie Jenner's new baby girl, and we bet Penelope and North West were just as excited to meet their new cousin!

Kourt was used to being the "mom" in the K clan, but now everybody except for Kendall has babies! The Internet is going crazy trying to find out what Kylie named her newborn daughter, and some people think they've figured it out.

Quite a few fans think she's going to call her "Posie," which is short for the Spanish name Mariposa. Where would that come from, you ask? Well, it means "butterfly," and there were several clues in her pregnancy video about the beautiful insect. Not only that, but the 20-year-old and baby daddy Travis Scott have matching butterfly tattoos, and the nursery is covered in butterflies as well.

Did Kris Jenner let the cat out of the bag?

"So cute! One of my favorite Kylie Cosmetics shades!! Posie K is launching as a limited edition trio set to celebrate the second anniversary! Feb 5 on KylieCosmetics.com," she posted on Instagram shortly after the birth.

Khloe is the next one to pop!