Just because you're not on tour with 'em doesn't mean you can't sing their songs.
Katy Perry kicked off her "California Dreams" tour in Lisbon, Portugal, and it wasn't just her own Grammy nominated songs she sang. The pop star took a break in her set to bust out her best mashup cover of Jay-Z's "Big Pimpin'," Rihanna's "Only Girl (In The World)," and Willow Smith's "Whip My Hair."
Take a look -- think she pulled it off?
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