Well, that was fast!

Rob Kardashian and his fiancé Blac Chyna Angela Kardashian announced they were expecting their first child. Chyna, 27, and Kardashian, 29, shared the good news themselves in matching Instagram posts.

👶🏽🎉

A photo posted by www.Lashedbar.co (@blacchyna) on

This is Kardashian's first child and Chyna's second. She's already mother to King Cairo, 3, with her ex- fiancé Tyga, who is in a serious relationship with Kardashian's sister Kylie Jenner. Kardashian and Chyna's child will also be the only Kardashian baby to carry on the family name, since Kim and Kourtney's children all took their fathers' surnames.

When Kardashian and Chyna first went public with their relationship in January, they didn't receive much support from Kardashian's family. However, Chyna's positive influence over the former recluse is undeniable - so far she's helped Kardashian lose nearly 70 pounds - and since the couple announced their engagement in April, Kardashian's siblings seem to have made peace with Chyna.

Mazels all around for the happy couple!