There aren't many thriving girl groups but the world has two quartets slaying the game. U.K.'s Little Mix and America's Fifth Harmony continue to serve up some epic girl power in 2017. Little Mix won U.K.'s "X Factor" in 2011, and now they have four successful albums under their belt. While Camila Cabello went solo in late 2016, Fifth Harmony persevered as a quartet — adding the smash "Down" to their collection of hits. Both acts support each other, but who's the reigning girl group in 2017? 🎤
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