This Teen Mom Ex Loves Going Shirtless! Can You Guess the Rock-Hard Abs? (PHOTO)

It's been a minute since we checked in with Maci Bookout's hunkerific ex-boyfriend, but he appears to be doing just fine. Not only has Kyle been hitting the gym like whoa, but he's also been hanging out with his friends, fixing up his car, and working on some tunes. Living life to the fullest, bro!

Did you know it was Kyle? Tell us below and click here to play more Teen Mom "Guess Who."