From what we've been hearing, NICKI MINAJ and MARIAH CAREY haven't exactly been BUDDIES on the set of "American Idol" . . . but Nicki doesn't seem to hold any personal grudges.

--In an interview with E! News, Nicki said that she'd be up for performing alongside Mariah on "Idol".  She said, quote, "I would do that.  I think people would be interested in seeing that."

(--From allegedly threatening to SHOOT her to performing onstage with her?  This is kind of like TUPAC and BIGGIE in reverse.)