WASHINGTON — Jay Z, music mogul and husband to Beyonce Knowles, was, apparently, attacked by her younger sister last week — and it was all caught on video.

According to TMZ, who obtained the surveillance footage, Solange Knowles steps onto an elevator with her sister, Jay Z and another man. The video is silent, but Solange approaches Jay Z followed by an attack with her feet and fists.

TMZ reports it happened at a Met Gala party at the Standard Hotel in NYC.

The large man, who may be a bodyguard, tries to hold Solange back during the assault. At one point, Beyonce stand between the two, but isn’t hurt.

For the full effect, you have to watch:

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