CeeLo Green
was a tough guy! 

The singer posted one epic throwback picture via Instagram on Thursday, which shows him as high school kid with a bit of a bad boy side.

"TBT School days at Riverside Academy," he captioned the candid snap. In the vintage pic, Green is posing shirtless with his boxers pulled up above his jeans. The former "Voice" coach is also sporting some super adorable spectacles.

We would have never known that was CeeLo just by looking at the photo -- do you think the R&B crooner's changed a lot?  

Tell toofab in the comment section below, and click "Launch Gallery" above to see even more stars before the fame!

Hot Videos