Joe & Nick Jonas Show Off Their Buff Arms in Las Vegas!

Joe Jonas stays cool in a black pair of sunglasses on while stopping by the Encore Beach Club at the Wynn in Las Vegas on Saturday afternoon (August 16).

The singer celebrated his 25th birthday with the company of his little brother Nick.

PHOTOS: Check out the latest pics of Joe Jonas

The day before, Joe took to Twitter to wish his parents a happy anniversary since his birthday was kind of stealing their thunder.

“Thank you for the [birthday] wishes! Happy anniversary to my parents! @PapaJonas @DeniseJonas,” he tweeted.