Justin Bieber's
getting ripped!

The pop star posted a new photo to Instagram on Thursday, showing off his fit physique in a collage of gym pictures.

"Back in the gym #dontbescared #orangegymrats," he captioned the candid snap.

Going shirtless in the sexy photos, the 20-year-old's numerous tattoos and growing muscles are on full display. We gotta hand it to the "Boyfriend" singer -- he does look pretty dang good!

It also seems like the Canadian crooner is starting to turn his life around in the right direction.

Earlier this week, the Biebs was spotted hanging with ex-girlfriend Selena Gomez. The pair even visited the Los Angeles Zoo together and hit the studio. We'd love seeing the former flames get back to their old, adorable selves ... and Justin staying out of trouble.

What do you think about Justin's gym pics? Tell toofab in the comment section below and click "Launch Gallery" above to see even more sexy stars!

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