It's the family feud the world is talking about today. Solange Knowles attacks sister Beyonce's hubby Jay Z on an elevator.

Beyonce, JAY Z and Solange were at a Met Gala after-party at the Standard Hotel in New York City and according to TMZ, things didn't end on a happy note.

The gossip site obtained surveillance footage of the three getting into an elevator just before Beyonce's sister began physically attacking Jay. There is no audio in the video but it is very apparent that Solange is yelling at her sister's husband before hitting him several times. She even goes into the "windmill motion" swinging both arms at him.

Another man on the elevator pulls her off of Jay and tries to hold her. She begins kicking in Jay's direction. Jay never tried to defend himself and you can see Beyonce standing next to her man not doing anything.

There has been no reason given as to why Solange did this. Reps for the three have yet to comment.