They are the music world's King and Queen of Cool, but Beyonce and Jay Z seemed eerily chilled out during Solange Knowles' now-historic elevator attack, caught via surveillance footage at the Standard Hotel during last Monday's Met Gala afterparty. As the entire Internet seemingly posits theories on exactly what set Beyonce's little sister off, one source explains to Us Weekly that Solange's tantrum was familiar to her sister, 32, and brother-in-law, 44.
"Solange has flipped her lid like that before," the insider explains of the stylish singer and producer, 27. "She is genuinely a sweet and nice person but she also keeps sh-- real. She can take a small thing and it triggers her."
As Us reported late Monday, Solange inexplicably yelled at designer pal Rachel Roy and others earlier in the evening during the Boom Boom Room party on May 5. Her famous older sister "got in the middle of it," although the exact source of Solange's ire remains unknown.
"This is not the first time this has happened," the first source says of the elevator fit. "That's why Bey and Jay were so calm. They are used to this from Solange. It has definitely happened before."
By the end of the evening on May 5, the sisters Knowles were seen exiting the bash and boarding one car—with Jay Z notably traveling in a different vehicle. "It is a testament to Beyonce's calm nature how she kept back and played the peacekeeper here," a second source says. "She is so calm and always the peacekeeper."
Still, an observer at the Met Gala notes that Beyonce seemed off during the evening. "She wasn't smiling, was hardly with Jay, she was off with Solange the whole time," says the witness.
Blue Ivy's mom "does not approve of violence," the first source says. The trio "are trying to put the situation past them now."
How in the world did the elevator footage get leaked to TMZ, anyway? "The video was recorded on a cell phone from the monitors in the back room," a staffer at the Standard Hotel tells Us.