She said: "Really enjoyed talking to duchess and Diva Meghan Markle about 'The Duality of Diva.' Yes! I called her a diva, in the most fabulous, gorgeous, and empowering meaning of the word!!! #Archetypes."
The show was billed as an exploration of the "complexities surrounding the 'diva'" and the negative connotations associated with the word.
Meghan used it to mention Carey's infamous reported diva demands, including rumoured requests for 20 white kittens and 100 white doves when she turned on the Christmas lights in London.
During the 46-minute episode, the singer told the former Suits star, who shares two children with her 37-year-old husband Prince Harry: "You give us diva moments sometimes, Meghan. Don't even act like...", with the duchess responding: "What kind of diva moments do I give you?"
The duchess added at the end of the show: "It was all going swimmingly, I mean really well, until that moment happened, which I don't know about you but it stopped me in my tracks when she called me a diva.
"You couldn't see me, obviously, but I started to sweat a little bit. I started squirming in my chair in this quiet revolt. Like, 'Wait'. 'What? No. What? How could you? That's not true. Why would you say that?'
"My mind genuinely was just spinning with what nonsense she must have read or clicked on to make her say that."
The duchess said Carey had quickly reassured her she meant the term as "chic" and "aspirational".
