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.]
Julie Andrews must be proud!!!!
And this is just some rehearsal footage!
WOW, just WOW!
We wouldn't be surprised if she moved mountains with all that vocal power when the final product flashes on NBC December 5!!!