The entertainment world has reacted with shock and bewilderment to the video showing Beyoncé’s younger sister Solange Knowles physically and viciously attacking Beyoncé’s husband Jay Z last week Monday (May 5) in the elevator of The Standard Hotel in New York as they left the Met Gala.

Upon making their exit from the hotel’s venue, the Boom Boom Room, and entering an elevator, Solange “flipped out over something Jay had said, that she took the wrong way,” reports US Weekly. “Not sure what it is was, but she greatly overreacted.”

In surveillance video footage from the elevator obtained by TMZ, Solange can be seen yelling at the rap mogul, 44, before violently kicking and swatting at him, while a stoic Beyoncé looks on.

“At one point,” according to TMZ, “Solange even smacks Jay with her purse … spilling the contents all over the floor of the elevator.”

Latest reports indicate that Solange might have been drunk as at the time of the attack. She was said to have argued with designer Rachel Roy shortly before the incident.

Beyoncé’s 27-year-old sister had become drunk and “belligerent,” according to The New York Post, adding that she was “like a pressure cooker waiting to explode.”

“Solange had too much to drink and was out of it by the time the performances started after the dinner at the Met Ball — she was dancing like a crazy person,” a source said.

Another source said the “Losing You” singer argued with Roy shortly after arriving at the Standard and Beyoncé, 32, came to her defense when another guest attempted to intervene.

When the female guest asked Solange, “‘What is your problem?’ Beyoncé defended her sister and told the guest, ‘You don’t get to speak to my sister that way.’”

•Photo shows Jay Z, Beyoncé and Solange Knowles exit the Boom Boom Room following the Met Gala on May 5.