the 2013 vmas. justin performed a medley of his greatest hits and surprised the crowd with some old friends, his former bandmates from 'n sync. >> i'm not sure how many vmas i won, but i know somewhere around half of them are with the group. and so i felt like this would be a nice moment to send tribute to those guys. i just wanted to include them in that moment. >> 2013 was one of the biggest years in justin's career. and it seems like his star is only rising. he appeared in two movies, earned three awards at the american music awards, and kicked off a world tour. even so, justin doesn't take anything for granted. >> if there's anything that i've learned in my experience, it's to try to, like, stop and enjoy those moments.