The Backstreet Boys made a surprise appearance at the Balmain x H&M show in New York. Watching Kendall Jenner and Gigi Hadid dance to "I Want It That Way" is the cutest thing you will see all day.SUBSCRIBE to Cosmopolitan: http://goo.gl/MJgRO8Cosmopolitan is the best-selling young women's magazine in the U.S., a bible for fun, fearless females that reaches more than 18 million readers a month. We deliver the latest news on men and love, sex, fashion and beauty, women's health and self-improvement, and entertainment.Cosmopolitan Official Site: http://Cosmopolitan.comCosmopolitan on FACEBOOK: http://bit.ly/CosmoFBCosmopolitan on TWITTER: http://bit.ly/CosmoTwitterCosmopolitan on GOOGLE+: http://bit.ly/CosmoGoogleCosmopolitan on PINTEREST: http://bit.ly/CosmoPinsCosmopolitan on INSTAGRAM: http://bit.ly/CosmoInsta