Well, this is QUITE the accusation.
She shared a clip of the part the hitmaker stole, and called her out in the caption, writing:
[Image via Beyoncé/Marlyn Ortiz/Instagram.]
Well, someone is finally here to clear things up- Me… I Am Mariah!
Ch-ch-check out the video (above) to see The Elusive Chanteuse herself give all the deets on her new drop!