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.]
"I don't know which one was Liam and which one was Chris, but I just know they're both hot as f*cking hell."
[Imags via BauerGriffinOnline.]