Fashion's Night Out is back for the fourth time and this season, you can shop limited-edition apparel with Justin Bieber and Taylor Swift. Watch the video above to see the two star singers show off their one-of-a-kind tees that you can buy for yourself. The shirt's proceeds will benefit the New York City AIDS fund. Become an insider and celebrate FNO with the fashion industry on September 6 in NYC and all over the world. [Racked]