Grainy black and white CCTV footage of Solange Knowles attacking her brother-in-law in an elevator following a Met Gala afterparty in 2014 shattered the veneer of Beyoncé and Jay-Z's picture perfect image. The headline-grabbing video, which was leaked online, sparked a flurry of theories, including one which claimed Solange's anger stemmed from what she assumed was Jay-Z's alleged affair with Rachel Roy. Now, 11 years after the infamous incident, fashion designer Oscar G. Lopez (pictured) has revealed the reason.

In an exclusive interview with the Daily Mail, Lopez, 52, claimed Roy ran into Jay-Z at the Met Gala. The hip-hop mogul then paid her a compliment after being taken aback by the beauty of her black lace gown, which Lopez designed. 'I think that Jay complimented her about the gown and Beyoncé's sister felt that it was not proper, so it was a kind of a drama there,' he said. The shocking footage showed the Cranes in the Sky singer, dressed in a sherbet orange Phillip Lim gown and sporting a pixie cut hairdo, shoving and pushing the '99 Problems' rapper into a corner of the elevator as security tried to restrain her.

Meanwhile, Beyoncé, wearing a black Givenchy Haute Couture gown with intricate beading and a matching veil, exchanged words with her sister and then-husband of six years but did not intervene in the physical fight. The scandal captured global headlines, which Lopez saw as good for business. 'Any press is good press,' he said. 'It's good that people talk about you. Sometimes you benefit from a scandal, not even being part of it in a very direct way. Let's just call it a collateral damage. It was meant to be.'

Roy (pictured), now 51, asked Lopez to design a dress for the Met Gala after he won Season 1 of the Project Runway spinoff Under the Gunn. He got the call with less than two weeks' notice, but much like on the reality competition show, the Cuban-born craftsman seamlessly constructed the one-of-a-kind dress, made with French sequined lace and silk organza, just in time. However, Lopez said that, on the night of the event, Roy was late to the carpet so she was unable to get photographed on the steps of the Metropolitan Museum of Art.

When the scandal broke, though, Lopez recalled: 'The dress was all over the news.' He said he and Roy laughed off the ordeal, thinking it was 'so silly' since Roy was once married to Jay-Z's former pal and business partner Damon Dash. Roy had interned at Rocawear, the fashion label started by Jay-Z and Dash before working her way up to creative director of the women's and children's lines. Jay-Z, now 55, and Solange, now 39, released a joint statement to the Associated Press at the time stating that they had 'apologized to each other' and moved on from the situation as a 'united family.' The 'Big Pimpin' rapper also said in a 2017 interview with Rap Radar that he and Solange were 'cool,' adding she is like a 'sister.'

Then, in 2016, Beyonce, now 44, released her Lemonade album, which included a song called Sorry and referred to an alleged mistress as 'Becky with the good hair.' Many fans speculated at the time that the lyric was a reference to Roy. The Rachel Roy collections founder, known for her long brunette locks, then cheekily shared an Instagram post with the caption, 'Good hair don't care' but later claimed her comment was misconstrued. Jay-Z seemingly confirmed he had been unfaithful, but has never disclosed who with, on his track Family Feud in 2017 which features the lyrics: 'Yeah, I'll [mess] up a good thing if you let me / Let me alone, Becky.'

He also addressed his behavior in interviews with T magazine and David Letterman, telling the late night host in 2018: 'I have a beautiful wife who’s understanding and knew I’m not the worst of what I’ve done. We did the hard work of going to therapy and you know, we love each other, right? So we really put in the work.' The Daily Mail has reached out to Jay-Z's reps for further comment on the matter but they could not be reached.