PROOF this auto-tuned painted fake is not a pro......
In the footage, obtained by TMZ, THE AUTOTUNED chipmunk wonder is clearly furious ... shouting, "I told them, I'm not f*ckin' putting up with her f*ckin' highness over there."
Sources say Nicki later threatened to "knock out" Mariah ... but that part wasn't captured on tape.
It all went down while the two were sitting at the judge's table ... with Keith Urban sitting in between them and Randy Jackson sitting on the far end, next to Mariah.
Source said the whole thing exploded over a disagreement about a contestant's performance.
According to MouthToEars.com, producers ended the auditions for the day so the two judges could cool down.
Big wigs on the show seem uncharacteristically upset by the blow up -- it appears this was no joke and it seems producers are worried about Mariah and Nicki co-existing for the long haul.
Nicki Minaj gave Lil Wayne a $70,000 sports car for his birthday. Wayne says he can't wait to get into that pricey plastic ride with airbags. And when he's done with Nicki Minaj, also the car.