It's a day of celebration! Not only is Nick Jonas dropping his brand-new music video for "Jealous," it's also his 22nd birthday (September 16).

Now Nick has grown up a lot since his shaggy-hair Jo Bro days, turning into one of pop music's hottest guys. From the six-pack abs and bulging biceps to a face that makes hearts melt. So let's celebrate Nick's B-day with a roundup of his best buff moments and, get ready, because you're about to do a whole lot of swooning.

1. Looks Good With His Shirt

2. And Without

3. Like Really Good Without

4. Do Not Be 'Careful What You Wish For' If You're Wishing For This

5. Have 'Mercy'

6. He Works Hard For That Body

7. By Scaling Walls

8. And Breaking Through 'Chains'

9. Baby Got Back

10. He's Such A Tease

11. Strippin' And Flexin'

12. Is It Hot In Here?

13. NBD, Just Forgot His Sleeves

14. He's A Lover -- And A Fighter

15. Touchdown!

16. Are You Still Breathing?