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.]
The duo lit up the stage with their combined performance of not uno, not dos, but tres party anthems at the 2013 Premios Juventud!
Ch-ch-check out the video (above) to see J-Lo and Pitbull perform a medley of On The Floor, Don't Stop The Party, and Live It Up!
Make sure you stay til the end! The pair get so caliente, they have to cool off by jumping into a pool!