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Rihanna
Twitter: @rihanna
She may be a bad gal, but RiRi's edgy fashion and beauty experiments make bad look so good. When the Barbados-born superstar isn't busy topping the Billboard song charts, you can find her collaborating with M.A.C. (her RiRi Woo lipstick sold out in just three hours), winning a CFDA Fashion Icon Award or palling around with supermodels like Cara Delevingne and Joan Smalls after sitting front row at Chanel.
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Beyoncé
Twitter: @beyonce
Instagram: beyonce
Beyoncé has been influencing the world of fashion since her Destiny's Child days, and a quick glance at her Instagram now proves the world is her runway. The L'Oréal spokesmodel can currently be spotted wearing designs from Michael Costello and Riccardo Tisci of Givenchy on her On The Run tour, and she even featured fellow "It" girls of fashion, Jourdan Dunn, Joan Smalls and Chanel Iman in her recent music video Yoncé.
As fashion changes, getting bolder and more exciting every season, so too do the faces behind the biggest brands. Whether their muses are walking the runway or the red carpet, designers are clamoring after a new, more diverse set of faces with an impressive following of their own to model their clothes. From established trendsetters like Rihanna to fashion newcomers like Riley Montana, you can spot these jet-setting "It" girls working with fashion's biggest designers -- be it strutting the catwalk or sitting front row.