JAY ZBEYONCÉ and her sister SOLANGE KNOWLES went to the annual Met Gala in New York last week, and apparently something happened at an after party that made Solange ATTACK Jay Z in an elevator.


TMZ released the surveillance video, and since there's no audio, it's unclear what Solange was upset about.  But she was FREAKING OUT.  


She yells, lunges at Jay, pushes him, hits him with her arms and purse, kicks at him, and has to be restrained by a guy who looks like a bodyguard.  


There's another woman in the elevator and it definitely looks like Beyoncé.  She mostly stays out of it, but does step in between them.


The whole thing lasts over three minutes, and you can see the bodyguard pushing buttons while he's bear-hugging Solange.  We're assuming he stopped the elevator to keep things private.   She finally stops a couple minutes in, but keeps yelling.  


Then when the doors open she goes at him AGAIN, before they finally get out.


Supposedly it was over something Jay Z said, that she took the wrong way.  But no one's commented yet.  And the footage was leaked by hotel security.


(Here's the video.  Jay Z's on the left, Beyoncé is next to him, and Solange is on the right.)