Solange Knowles ATTACKS Jay Z: See the Footage!

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Beyonce and Jay Z looked as calm and happy as ever at the MET Costume Gala in New York City last month.

The latter's mock proposal even melted the Internet for a few hours.

But something went very wrong following this event, as TMZ has obtained surveillance footage of Solange Knowles absolutely GOING OFF on her brother-in-law inside an elevator at the Standard Hotel that same night.

It's unclear what prompted the violent attack, but Solange berates Jay Z before punching and kicking him.

Watch now as Beyonce stands idly by and a bodyguard gets in between Solange and her target, who doesn't respond in any sort of physical manner:

WTF, right?!?

Even Porsha Williams and Kenya Moore think things got out of hand between Solange and Jay Z.

UPDATE: TMZ has released the FULL surveillance video.

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