Mercedes Benz Fashion Week kicked off in New York last week and all the stars came out in their finest outfits to check out the fashion shows. Oh, and also Justin Bieber debuted what we can only describe as a mustache at the festivities.

Once you see it, you won't be able to unsee it. You have been warned.

As if the fact that the Biebs showed up at Fashion Week with this on his face wasn't frightening enough, he also happened to be in the front row for several shows, which makes it that much worse.

Looking like the creepo Uncle from 'Napoleon Dynamite,' Bieber even went backstage to meet designer Yohji Yamamoto who didn't laugh at him or anything. Even though he wouldn't take off his sunglasses at night.

It's cool, he just wears them so he can, so he can watch you while you sleep.

You can check out all the photos of the Biebs attending Fashion Week thus far below ... just remember when you can't sleep tonight that we warned you. Oh, how we warned you.

Justin Bieber
Vivien Killilea, Getty Images
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Justin Bieber
Vivien Killilea, Getty Images
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Justin Bieber
Jemal Countess, Getty Images
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Justin Bieber
Jemal Countess, Getty Images
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