Credit: Rachid Ait , PacificCoastNews.com, Grey Wasp/Blue Wasp/Splash News

Is the world really big enough for two adorable, catchy, and shirtless British-Irish boy bands? Ask any tween from here to Mars and you'll get the same answer: a painfully high shriek!

So if you've been wondering who sings "What Makes You Beautiful" — you know, the song that's been stuck in your head for the past three weeks — it's time to get to know One Direction, a product of The X Factor Season 7 and Simon Cowell's star-finding genius. While the group is quickly becoming the world's next pop sensation, fellow boy band The Wanted, created in 2009 by Jayne Collins, isn't far behind, with instant hits like "All Time Low" and "Glad You Came" invading earbuds everywhere.

So, as we all join together and fill our iPods with these upbeat tunes, we ask you perhaps the single most important question of our time: Which of these shirtless performers do you think is hotter? Harry Styles (center) and Louis Tomlinson (right) of One Direction, or Tom Parker (left) of The Wanted? Vote in our poll below!

Alissa Kombert is a photo editor at Wetpaint Entertainment. Follow her on Twitter @AyeKayArt.

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