On Wednesday, Rob Kardashian (the one who is male and whose name doesn't start with a K) and his fiancee Blac Chyna shared with the world the gender of their unborn baby. Well, they didn't, a source "close to the pair" revealed it to Us Weekly. Either way, word is out—they're having a girl. Congratulations!

My babies so pretty πŸ˜πŸ‘ΆπŸ½

A photo posted by ROBERT KARDASHIAN (@robkardashian) on

Blac Chyna has another child, a 3-year-old boy named King Cairo she had with her ex, Tyga, but this is the first child for Rob. Previously, he's said that if he ever had a son, he planned to name him Robert, after his late father. But what will he name a girl? Roberta is an obvious option, but maybe something more original like Robertina? Robertetta? Well, they still have plenty of time to decide; the baby's not due until fall.