Katy Perry Dances To Britney At West Hollywood Club

?Katy Perry seemed to be in quite an upbeat mood on Saturday night when she made her way to Club Robertson's Rasputin night in West Hollywood.

Right across the street from local celebrity favorite spot The Abbey, the "Part of Me" singer didn't go incognito as entered the venue with her purple hair capping off a red dress .

"The DJ announced a little after midnight that she was there," a club-goer tells PEOPLE. "She partied at a booth with ...

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