Donned in hip new Fashion's Night Out T-shirts, country songstress Taylor Swift and pop sensation Justin Bieber have teamed up to advertise the popular 2012 event. Every year, fashion editors, models, designers, celebs and fashionistas get together for a late night of shopping and mingling. This year, Swift and Bieber are acting as spokespeople, spreading the word about the action before FNO goes live on Sept. 6.

Since both Swift and the Biebs are known for looking smashing everywhere they go, it only makes sense that they would become the faces of this year's FNO.

In the simple black and white promotional video, Swift looks adorable in a black FNO tee paired with glittery shorts and high-heeled boots. Bieber is rocking a leather vest over his own event T-shirt and sporting a sweet pair of kicks, per usual.

With a relaxed, conversational style, both Swift and Bieber talk up FNO, adding that stores all over the country will be open late on Sept. 6 to participate.

"And that's a lot of stores," Swift jokes.

Bieber, on the other hand, is more caught up in the fact that there will be loads of gorgeous models present at FNO. "And who doesn't want to meet models ... Right?" he asks, looking earnestly into the camera.

Most importantly, both Swift and Bieber point out that those awesome black T-shirts they are wearing are for sale -- and for a good cause, too. The proceeds will be donated to the New York City AIDS fund. For more information about 2012 Fashion's Night Out, click here.

Also on Sept. 6, Taylor Swift will sing her new single, 'We Are Never Ever Getting Back Together,' live for the first time ever at the 2012 MTV Video Music Awards.

Watch Taylor Swift and Justin Bieber in the Fashion's Night Out Commercial