Looking good, Catelynn Lowell!

The Teen Mom OG star just shared this photo on Instagram from the MTV series' reunion — and fans were quick to take notice of her impressive weight loss transformation.

MORE: Catelynn Lowell and Tyler Baltierra Arrested — Find Out Why

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#workworkwork 😎☀️❤️

A post shared by Catelynn Baltierra (@catelynnmtv) on

Cate has been open this season about wanting to shed the pounds and even discussed doing Weight Watchers, while her husband, Tyler Baltierra, faced a great deal of backlash for what fans considered to be "fat shaming."

See more pics of Catelynn through the years in our gallery!