Nick Cannon Hilariously Congratulates Mariah on Engagement!

1/23/2016 6:37 AM PST BY TMZ STAFF
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0123-sub-nick-cannon-instagram-01Nick Cannon was hospitalized after getting the news soon-to-be-ex-wife Mariah Carey got engagement to a billionaire ... so he joked.

Nick posted this meme on Instagram ... the pic is from "Real Husbands of Hollywood."

Our sources say Nick and Mariah are now getting along, and we're told she called him Thursday afternoon to give him the heads up she was getting engaged.   By the way, that means she clearly knew what was going down before James Packer popped the question!

As we reported, Nick and Mariah are not officially divorced ... in fact, they haven't fully settled up in the money dept.  Ditto James, who's also still married though in the process of divorcing wife #2.