Britney Spears is the wise old soul in her "Pretty Girls" duet with rapper Iggy Azalea. But when Spears and Azalea perform together, it's safe to say nobody thinks much about souls. It's more about midriffs (and riffs). The duo doesn't exactly rub on one another like Iggy rubs on JLo for "Booty" -- but "Pretty Girls" emphasizes that the singers match the title. They're pretty girls.
Britney and Iggy hit the Billboard Hot 100 at No. 29. They'll perform together at the Billboard Music Awards on May 17. Is it their similarities or their differences that intrigue? Think you know Britney Spears and Iggy Azalea? Take the quiz. Who said it?
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