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The Baltimore Sun

Where's Ke$ha?!

Britney Spears made a grand entrance during Nicki Minaj's performance to deliver their remix of the Ke$ha penned "Till The World Ends," but where the heck was the pop party girl?! Ke$ha was definitely in the house, but the "Femme Fatale" tour mates carried on without her. We're all about seeing Nicki and Britney live, but if Ke$ha's available, we want her too. --Sophie Schillaci, Zap2it Getty Images