Since joining the site in June 2012, Jen has already amassed over 2 million followers!
She mostly posts pictures of her butt, but she mixes up the scenery a little bit. Often times, she's in the gym, but sometimes she'll surprise us with a photo of herself planking in a random hallway, or on the subway...or anywhere, really.
Of course, there are those who doubt that Jen's butt is real and she addressed the caboose conspiracy theorists in a recent interview with Muscle and Fitness.
"I get 'fake butt', 'butt implants', 'Photoshop', I can go on and on. It doesn't offend me. I know my butt is real and it's hard work. You can't fake fitness, so I will take it as a compliment," she told the mag.
To see what all the
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Gallery | Jen Selter's Backside Takes Instagram by Storm