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While promoting her new job as the Jenny spokesperson, a newly slimmed-down Mariah Carey dissed Kim Kardashian while chatting away with Gayle King.

After being asked about her marriage with hubby Nick Cannon, Mimi took a swipe at Kim ... telling Gayle:

    "I'm a real person, I'm not going to put on a fake face for Hollywood. Sometimes we make each other mad, that's why we aren't divorced after four months."

The crowd reacts with gasps. Check it out at the 41:44 mark! In response, Mariah adds, "Im sorry, I'm just saying."

Kim Kardashian and Kris Humphries were married for only 72 days. Guess Mimi has a point!