Solange Knowles and Beyonce Dance at “Life is But a Dream” After Party (VIDEO)

Those Knowles sisters sure know how to have fun!

Last night at the Life is But a Dream screening, Beyoncé revealed her HBO documentary set to air this Saturday to the press at the Ziegfeld Theatre in New York City. With guests like Oprah Winfrey, her husband Jay-Z and others, the A-list crowd kept the party going at a celebratory event with her sister Solange Knowles as the DJ.

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With tons of paparazzi photos floating around the internet giving fans a mere peek into the private event, a new video has surfaced of Beyoncé with her little sister Solange getting down at the overflow. The video was posted on Rubin Singer’s YouTube page – the designer who put together her leather and lace body suit for her Super Bowl performance.

As Solange DJ’d, Beyoncé joined her sis behind the booth and danced to the music.

Following in her big sister’s footsteps, ESSENCE Magazine announced that Solange has joined the ESSENCE Musical Festival in July 2013. The 26-year-old released her EP, True in November 2012, featuring the lead single Losing You.

Winfrey, who held a separate interview with the “Countdown” singer for her Next Chapter series, spoke of her excitement for the new documentary, calling it a “game changer.”

“She did an amazing job. People are going to be amazed,” Winfrey said. “People are going to feel a connection to her that they didn’t feel before. Because she shows us how real she is. She understands that all pain is the same. The way she hurts is the same way other people have hurt."

She added, “I think the documentary is going to be a game changer.”

Oprah’s interview with the 31-year-old performer airs an hour prior to the HBO doc, at 8pm on OWN on Saturday.

It seems like Knowles’ fever is just heating as both sisters are set to embark on tours and release new music this year.