During an appearance on Watch What Happens Live on Sunday, Mariah Carey played an interesting game of “Plead the Fifth” -- in which she made not have pled the fifth, but she basically didn’t answer any questions. Although she did slam Demi Lovato — so at least something somewhat saucy came out of the interaction!

First the singer not-so artfully dodged questions about her break up with James Packer, the $50 million break up buy out, and her romance with back-up dancer Bryan Tanaka — but then host Andy Cohen asked her about when Demi dissed her.

Andy said, ”Demi Lovato, I didn't know this, she kind of shaded you on social media. She made assumptions about Ariana Grande, and she said, 'Mariah's a legend and she's so talented but she disses people. It's nasty the way she treats Jennifer [Lopez].' What would you say to Demi?"

Mimi, who has infamously said she “doesn’t know” Jennifer Lopez even though J.Lo says they’ve met “many times,” unleashed her spiked tongue on the “Heart Attack” singer.

The “All I Want for Christmas” crooner said, ”I don't know her either and so I wouldn't say anything to her. She should come up, introduce herself to me, say, 'Here's my opinion, what do you think about it?' That's how you handle s--t, OK?"

When asked if she knew who pop star Ariana Grande, whose voice is often compared to Mariah’s, she said, "No. I don't know … Honestly, I'm not familiar. I listen to hip-hop more than I listen to pop music."

Always a diva!