Solange Knowles & Katy Perry Rock West Hollywood

It was a regular diva-fest in West Hollywood on Robertson Boulevard Saturday night, as Solange Knowles performed to a packed house at club Ultra Suede, where promoter Tom Whitman hosts his popular Saturday night Cherry Pop party.

Beyonce’s younger sister performed hits from her latest album, “Sol-Angel & The Hadley St. Dreams,” including her hits “I Decided” and “Sandcastle Disco.”

VIEW THE PHOTOS: Katy Perry & Solange Knowles Rock Cherry Pop

But the fun didn’t stop there – also in the house to catch Solange’s performance, gossip blogger Perez Hilton and his special guest, Katy Perry.

After taking to the DJ booth to say “hello” to the crowd, Katy launched into an impromptu performance of her own – jumping on the stage with a go-go boy to sing live on the mic over her huge hits, “I Kissed A Girl” and “Hot N’ Cold” – the crowd went insane for her.

VIEW THE PHOTOS: The Latest Star Sightings

The entire evening was hosted by actor Wilson Cruz and was simulcast live on LogoOnline.com and TopFloorLive.com.

Related Content from AccessHollywood.com:
VIEW THE PHOTOS: 2009 Grammy Nominations Concert
PLAY IT NOW: 2008 MTV VMA’s: Miley and Katy
PLAY IT NOW: Solange Knowles On The Record, Part I

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