"Congratulations to my Family @blacchyna and @robkardashian!!! Pease don't let nothing or no one tear u guys apart," she writes. "I never seen my sis so happy and I couldn't be more happy for her! Sometimes we find love in the strangest places Lol God Bless you 2!"
It is a strange pairing, alright. Chyna is the ex-wife and baby mama to Kylie Jenner's boyfriend, Tyga!
"Now let's get this wedding together so y'all can start making some babies," Rose adds in her caption, along with the hashtags🏽 #TrueLove #putaringonitsouknowitsreal #BlacRob.
As we wait for the Kardashian clan to chime in, check out some of the best/funniest Twitter reactions to the news below.
I can't take Blac Chyna & Rob serious, the fact that Rob and his little sister have the same step-son is a joke within itself.