Carter has previously opened up about his body image issues and past issues with weight pain, and now he's making major progress towards being a healthy weight.
"[These are] my before and after pics," Carter wrote. "I went from 115 to 160 pounds in two months I feel amazing. 2018 I'm ready for you!! My new music is on its way!"
The before shot shows an underweight Carter with highly-visible abs and other bodily features. The after shot shows him at a more normal weight.
The comparison has already racked up 35,000 likes in a matter fo hours.
See the photos below.