Leah Messer debuted her petite frame during last night's season premiere of Teen Mom 2, but despite the fact that the mom-of-three has now enrolled in college, the only thing fans are talking about is her weight.

Over the years, the 25-year-old's body image has been under constant scrutiny, with fans even declaring her "too skinny," after one picture of the mother-of-three in a bikini went viral — which has since been deleted off Instagram.

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At the time, however, the the reality star didn’t shy away from using the attention as an opportunity to advocate for some body positivity and loving one's self. In an interview with Refinery29, she said, "First and foremost, there is much more to women than our bodies. Yet many women seem to continually judge others, not by their character, but by their bodies. There are way more important issues going on in the world today than whether or not I had enough to eat for breakfast. (Side note: I had plenty). We should be focused on spreading love and kindness instead of mean-spirited bullying. Thankfully I am in a beautiful place in my life raising three wonderful, kind, loving, and confident little girls. The last thing I would want for them is to feel that they, too, could be ridiculed for their bodies. So let’s stop with the shaming, start supporting one another, and focus on what really matters.” Preach, girl!

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In June, the single mama snapped a photo at the CMT Awards, looking happier and healthier than ever! She captioned the snap with singer, Lauren Alaina, "Yaaaas!!! This gal seriously deserved to win!!! I LOVE YOU !! You are so sweet!!! I'm so happy I came!!" Go Leah — tell the haters to take a seat!

Check out the the photos in our gallery below to see more of Leah’s body transformation!