Before the Brawl! Find Out What Happened At The After-Party That Sparked Solange's Attack On Jay Z — PLUS Inside Her Drug Habit

Jay Z, Beyonce and her sister Solange Knowles were the picture of elegance as they walked the red carpet at the Met Ball on May 5. But just a few hours later, it was a totally different story, as the younger Knowles attacked her sister’s husband in a bizarre elevator attack following the after-party at the Standard Hotel. Only RadarOnline.com has all the details about what happened inside the exclusive bash and how their night took a wild turn.

After the Vogue party at New York’s Metropolitan Museum, Jay and B hit up the after-party in the Standard Hotel’s Boom Boom Room. Although they arrived in the same car, they appeared distant, with Beyonce walking in a few feet ahead of her husband.

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Once inside, they were spotted deep in conversation at a secluded table in a deserted corner of the crowded room:

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For most of the party, though, Beyonce stuck by her sister’s side. Solange posed for an especially spirited pic with Oscar winner Lupita Nyong’o.

This is just the latest erratic behavior from the DJ and singer, who abruptly cancelled her European tour last summer amid rumors of drug use. Indeed, Beyonce’s sister has been an admitted drug user for years.

In 2008, she wrote an ode to marijuana called “Champagne Chronic Nightcap,” and confirmed to the press that it was about lighting up. “I am unapologetic,” she wrote. “I don’t write about things unless they’re true!”

In February, 2009, she tweeted about ending up in the hospital after a Nyquil overdose, and a few months later admitted that she thought her drug use was affecting her mind.

“I don’t even smoke weed that often, but I’m finding I can’t remember things,” she tweeted on Sept. 1, 2009.

The next year, she admitted to smoking “a joint or two” while recording, and in 2011, she blatantly tweeted fans looking for drugs.