The star came across the magazine feature, in which "Touch My Body" star Mariah was asked, "Which up-and-coming singer should I listen to?"
In the chat, the star replied, "Lizzo," and the singer/rapper took to Twitter to share her excitement at getting the diva's "stamp of approval".
"I got the @MariahCarey stamp of approval b**ch oooooohhhh my goooooooooooooodness," the "Juice" hitmaker tweeted alongside a snap of the interview segment on Saturday, November 9.
Ensuring the star knew her words were sincere, Mariah wrote back to Lizzo, insisting, "You don't need my stamp, you're 100% that b**ch!!!!" - referencing the opening lines from her chart-topping hit, "Truth Hurts".
She responded: "ilysm (I love you so much)."
"Truth Hurts" recently matched Iggy Azalea's seven-week record for the longest-running Billboard Hot 100 number one rap track by a female artist.