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.]
Justin took the stage with some of his hits, including Baby, as well as some tracks off his latest album, Believe!!
Check out JB (above) with his acoustic serenade of Fall!
Aww… wonder if he was singing it to Selenita!
Bieber also got the crowd pumped up with his fancy footwork, when he took on All Around The World!