Mariah Carey on Nicki Minaj - "I didn't know she sang"

Well, this clip will go down in "diva diss" history.

In an interview with Mariah Carey (which begins by looking back at her 20+ years as a super recording artist, her multitudinous awards and her 200+ million albums sold), Barbra Walters asks Mariah about the reported tension with co-American Idol judge Nicki Minaj.

Check the simple eye-roll and sassy line delivered with perfection at the 4:30 mark - "I didn't know she sang, I thought she rapped, or whatever..."