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.]
Awwww, look at him trying to be all macho and shiz.
Zac Efron - with Master Chief - hosted the 'Halo 3' video game launch in Universal City, California, on Monday, night.
Later on this week, he'll be at the launch of a new makeup line for men called Zimply Zefron!