Nick Jonas' Bulging Muscles Pop Out of His Shirt in Vegas!

Nick Jonas shows off his huge guns in a short-sleeved shirt while attending the 2014 Michael Jordan Celebrity Invitational Gala at the ARIA Resort & Casino at CityCenter on Friday (April 4) in Las Vegas.

The 21-year-old singer was joined by Grey’s Anatomy star Jesse Williams.

PHOTOS: Check out the latest pics of Jesse Williams

“Rock ‘n Roll @pablove golf tournament with @jestring @JohnLloydTaylor and Bob B was awesome! Group score of 58! Now off to Vegas for another,” Nick tweeted earlier in the day.

In case you wanted to check out more of Nick‘s bulging arms, he was recently spotted wearing a sleeveless shirt at the gym.