Perry falls to t...
Only Flo Rida and Ke$ha have had better weeks online.
Talking of Ke$ha, her We R Who We R ends 2010 by jumping back up the chart to three, while What's My Name? by Rihanna and Pink's Raise Your Glass round out the new top five.
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MARS ATTACKS U.S. POP CHART AND ENDS 2010 ON TOP · LIFESTYLE PICKS
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