Solange Knowles.
Beyonce's sister Solange Knowles attacked Jay Z at the Standard Hotel in New York.Reuters

Beyoncé's sister Solange Knowles has finally addressed the controversy surrounding the now-infamous footage of her attacking Jay Z in a lift after the Met Gala.

Speaking to Lucky Magazine, the 27-year-old singer, who was shown lashing out at her brother-in-law in the leaked CCTV video, insisted that everything was 'all good' between them now.

"What's important is that my family and I are all good," Solange said. "What we had to say collectively was in the statement that we put out, and we all feel at peace with that."

In the four-minute video obtained by TMZ, Knowles was seen violently kicking and punching the 99 Problems hitmaker at New York's Standard Hotel after what appears to be an exchange of words.

Although the rapper does not retaliate, at one point he grabs her foot to block one of several kicks. A bodyguard restrains Knowles while Beyoncé fails to intervene.

Days later, the trio said they had put the scandal behind them and urged fans to do the same.

"Jay and Solange each assume their share of responsibility for what has occurred. They both acknowledge their role in this private matter that has played out in the public. They both have apologised to each other and we have moved forward as a united family," a statement said.

"At the end of the day families have problems and we're no different. We love each other and above all we are family. We've put this behind us and hope everyone else will do the same."

While Knowles may have moved on from the attack, Jay Z and Beyoncé have struggled to put to bed speculation surrounding their marriage ever since the footage emerged.

Not only has it been suggested that their marriage is heading for divorce but Jay Z has been linked to a number of women, including rapper LIV, reality star Casey Cohen and singer Mya in recent weeks.

However, Cohen recently slammed the reports as "foul and phony mistress-rumours" and Mya insisted she could never be "the other woman."