Happy Birthday to Instagram superstar Jen Selter!

Jen Selter Flaunts Her Giant Hump As She Rests Comfortably

The fitness expert turned 22-years-old on Saturday where she posted a couple photos of her celebration. Naturally, she was showing off her curvaceous body in the pictures.

In the last few years, Selter has been making a big name for herself with her revealing images that show her either at the beach or at the gym. She started posting random selfies on social media where people started taking notice and looking her up. As her body gradually changed, she became the woman she is today with more than six million followers.

Jen Selter Shows Off Athletic Torso In Purple Sports Bra

While Selter is known for her abs, strong legs and small waist, it's her backside that became her main trademark.

See the slideshow for 22 of the fitness star's most memorable images from the past year.