Happy Birthday, Justin Bieber! The pop star sensation, who also complements his income by being an underwear model, is turning 24 today. What a wonderful opportunity to look back at some of his hottest moments, and conduct a close inspection of those famous abs.

Thankfully, Bieber returned to Instagram last year – so we’re getting a fresh supply of shirtless photos. But for now, let’s look at the glory of Bieber’s past.

1. This one was actually a gift from his father

Built like I was now I'm fat lol #handsomeson

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2. With all the tattoos

3. “Wowzers”

Wowzers

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4. Will taking his shirt off make you follow him on Snapchat?

Follow me on snapchat my username is rickthesizzler

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5. No longer a boy!

No longer a boy, there's a new man in town

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6. Nice view

7. Those world-famous undies!

Glacier dip in #iceland

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 8. Different undies! (But they’re wet again)

9. Holding on

#mycalvins

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10. Still sexy when brooding

11. The sun and the Bieber

12. Beach Boy

13. Feeding the Bieber

The kids gotta eat too

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14. Sporty Spice

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15. Remember that whole debate about the size of the… ehm… bulge?

16. Happy Birthday!

Dat ass doe @johnny photo cred

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