Jen Selter: How I Became an Instagram 'Belfie' Star

05/22/2014 at 12:30 PM EDT

Jen Selter: How I Became an Instagram 'Belfie' Star
Jen Selter
Gavin Bond
When it comes to hitting it big on social media, bum's the word!

At least that's the case for the 20-year-old New Yorker Jen Selter, who has squatted and lunged her way into the hearts and Instagram feeds of folks around the world thanks to her "belfies," or butt selfies, she posts online.

A couple of years ago "I started posting motivating fitness pictures and quotes that got me up and wanting to work out," Selter explains in this week's issue of PEOPLE featuring Hollywood's Most Talked About Bodies. "When I randomly added a photo of my own body, I saw a lot of likes."

"A lot" is an understatement. Thanks to her photos in which she poses everywhere from the subway to the pool – all while emphasizing her prized posterior – Selter now has 3.4 million followers on Instagram. Her online fame has also earned her deals with fitness brands and a closet full of her favorite butt-bearing garment.

Jen Selter: How I Became an Instagram 'Belfie' Star| Fitness, Bodywatch, Hottest Bodies

Jen Selter

Gavin Bond

"I have around 300 or 400 pairs of leggings," she says. "People think I wear the same black pair every day but it's not true – I have like 100 of those."

The Manhattan resident insists that she hasn't drawn inspiration from celebs famous for their rear, like Kim Kardashian or Jennifer Lopez, but that she follows fellow fitness stars and models on social media.

"Miranda Kerr is one of my favorites," she says. "She has so many different looks. There are people who I aspire to [be like], but I know I can't look like them. I will never think I'm a model."

For more on Selter and other buzzed-about Hollywood bodies, pick up the new issue of PEOPLE, on newsstands Friday

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