Kim Kardashian's pal Rachel Roy 'publicly argued with Solange' before singer attacked Jay Z in elevator at Met Gala after-party

While there has been no word from representatives of Solange Knowles, new details of her temperament on the night of the Met Gala continue to emerge.

Now UsWeekly report that the singer first lost her temper with fashion designer Rachel Roy, a close friend of Kim Kardashian.

The publication claims that Solange 'yelled' at Rachel - who recently attended Kim's baby shower - on the night of the Met Gala afterparty, when Solange was seen attacking her sister's husband Jay Z.

Crazy night: Kim Kardashian's pal Rachel Roy (left) 'publicly argued with Solange' (right) before singer attacked Jay Z in an elevator at Met afterparty, according to UsWeekly

A source tells UsWeekly that Beyonce had got in the middle of an argument between the pair, although it is unclear what it had stemmed from.

It was also reported that Solange was seen arguing with a number of other people at the bash.

Rachel is considered to be one of Kim Kardashian's closest confidantes and was even invited to Kanye's proposal to Kim last year.

Then, Solange can be clearly be seen kicking and swinging violently at Jay Z, the father of her two-year-old niece, Blue Ivy, after the trio step into the elevator.

The clip shows a man who appears to be a bodyguard holding her back, but the 27-year-old still manages to rain blows on Jay Z several times.

The bodyguard can also be seen pushing the emergency stop button in the elevator at the 12th floor, no doubt stop the fight spilling out in front of photographers.

During the frenzied altercation, Jay Z grabs Solange's stiletto clad foot to block a kick but never attempts to retaliate.

Inner circle: Rachel Roy is one of Kim Kardashian's closest pals, and the pair are seen here together in March 2012

They used to be friends: Solance and Rachel Roy even accompanied one another to the 2012 Met Gala

Speaking about the event, Rachel said at the time to E! 'It was a magical night filled with people that love Kim and Kanye dearly.'

While there has been no detail emerging on what Rachel and Solange were disputing, Kim has had her fair share of reported feuds with Solange's sister Beyonce.

Meanwhile, Solange accompanied designer Rachel to the 2012 Met Gala, and Rachel's ex-husband Damon Dash has endured a long-running feud with Jay Z.