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Justin Bieber is following another world-famous singer into the world of celebrity fragrance. “I actually like the Britney Spears perfume on girls. It smells good,” he tells WWD.  Now, the Canadian superstar is launching a collection of four unisex fragrances called My World with Etoile Nation Beauty, which will be available on scented dog tags and wristbands. Hit up Walmart stores on Black Friday (Nov. 26) to scoop them up…if you don’t mind inevitably massive crowds, that is.