http://www.collegehumor.com/moogaloop/moogaloop.swf?clip_id=6474802&use_node_id=true&fullscreen=1
Yvonne Strahovski, of Chuck fame, lampoons Katy Perry, Ke$ha, and Gaga in Three Pop Stars, One Song. Somewhat NSFW-ish, but the lyrics are quite witty and the tune is ear-worm-y.
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(Source: http://www.collegehumor.com/)