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.]
Check out the pic of them (above)!!!
As we mentioned, Si's other ex girlfriend, Sinitta, is on the trip with them, too (below)! Wonder which one he kissed at midnight…???
Boy, he definitely treats his former flames like royalty!!!
Such a playboy, that Cowell! LOLz!
[Image via FameFlynet Pictures.]