The Kardashians may be keeping mum on Blac Chyna and Rob Kardashian's engagement -- but not everyone is.

Rob's ex Adrienne Bailon says she hasn't personally congratulated the E! star, but she had nothing but nice things to say about her former flame’s proposal.

At the premiere of Barbershop: The Next Cut, the Cheetah Girl said, "I think everybody deserves happiness and I think it's just absolutely awesome. He looks like he’s so happy."

We have to admit -- despite the insanity of their relationship, he certainly does look happy!

Meanwhile, Chyna's mother Tokyo Toni also had some words about her baby marrying a Kardashian. The mouthy mom posted a ridiculous photo on her Instagram of Blac Chyna as a bride and three sobbing Kardashian sisters -- and the caption was even worse ...

Along with the Photoshopped photo, she wrote:
    “This is funny!! However!!! Her train would be so long they assess would be in the Michigan triangle holding it and miss the wedding!! That’s how far back they will be!! ” Shots fired” oh well!! It’s social media!! And all these reality hoes are ” Boxed or botched”. Bonus – You not even going to be invited! I didn’t see the invitation ! Ps’ To all her fake ass friends!! ” Oh b*tch I see you and NO b*tch will ever plan my daughters wedding but “Me” or her! #ps or her bestie – Whoeva that is? PS -,they are Armenian so no blonde hair blue eyes over here wheneva they do have a kid!! Let’s get it poppin now!! Lol!! Okay wheneva y’all ready but get the point."

WOW -- THAT LADY'S CRAYCRAY!

Yesterday, Tokyo Toni issued an apology for her offensive IG image -- but it was filled with back-handed insults. We can't wait to see what antics Tokyo and Chyna get up to!

Kris Jenner must be losing her mind ...