Forget Kim Kardashian -- the 'butt selfie' queen of Instagram is 21-year-old fitness guru Jen Selter

Meet Jen Selter. Since March 2012, she’s amassed millions of followers on social media who wait daily for her latest fitness photographs and inspirational mantras.

Many of her followers know her as the “Belfie Queen” of Instagram, and she’s fast becoming the new “it-girl” for women’s fitness.

Produced by Sam Rega

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