Justin Bieber vs. Austin Mahone battle of the six-pack abs [PHOTOS]: Take the 'Best Shirtless Teen Pop Star' POLL now!

Justin Bieber and Austin Mahone may be two of the younger pop sensations in Hollywood right now, but they're also two of the HOTTEST! Biebs is only 19, and the Junior Year crooner is just 17. But take a look at those abs - impressive!

Should we feel creepy right about now?

Nah!

Mahone has more of a chiesled, clean-cut look while the Biebs enjoys flaunting his tats and major v-line.

So... how about it Mstars fans? Which teen pop star wins the battle of the six-pack abs?