The truth behind Jay-Z and sister-in-law Solange Knowles’ infamous elevator fight has been revealed.

Fashion designer Oscar G. Lopez, who made Rachel Roy’s 2014 Met Gala gown, claims Jay-Z complimented Roy’s dress at the event, which upset wife Beyoncé Knowles’ sister.

“I think that Jay-Z complimented [Roy] about the gown, and Beyoncé’s sister felt that it was not proper, so it was a kind of drama there,” Lopez, 52, told the Daily Mail on Thursday.

Surveillance footage from inside an elevator at New York City’s Standard Hotel — which showed Solange lunging at, swinging at and kicking Jay-Z following an afterparty at the Boom Boom Room — leaked and immediately went viral.

Page Six previously reported that Solange was drunk and had gotten into an argument with Roy upon arriving at

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