Shirtless Birthday Boy Austin Mahone Goes Jet Skiing in Miami

It's only a matter of time before Austin Mahone takes over the world. But until that happens, the newly minted 18-year-old musician just wants to enjoy a day on the beach with his boys.

Mahone has been in Miami celebrating his 18th birthday this week and was even spotted out with perpetual trouble maker Justin Bieber. Austin sagged his shorts and showed off his abs down in Miami. (FameFlynet) “Riding jet skies on south beach!” he tweeted on Saturday, the day after turning 18. Austin put his shirt back on when playing catch with his pals near the ocean waves.