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ImageShe's been having a blast as the opening act on Rihanna's "Last Girl on Earth" tour, and last night Ke$ha was spotted rocking out in Los Angeles.

The "TiK ToK" songstress owned the stage at the Staples Center, singing and dancing to the delight of a packed house.

As for her new video for her single "Take It Off," Ke$ha told press, "It's my favorite video, I think, ever, that I've done because I get to play in glitter sand, and we all get clotheless because we're just, like, taking it all off."

"It's also about taking off your inhibitions and being raw and real," Ke$ha said. "And then we start tearing each other apart into pieces, and we're all made out of glittery magic dust ... star dust."

Enjoy the pictures of Ke$ha performing in Los Angeles (July 21).