The Ultimate Backstreet Boys Concert Checklist, From Butterfly Clips to an All-White Outfit

knliwkm Rimless Rectangle Sunglasses ($15)

Yup, everyone was rocking these rectangular sunglasses — the same style the Backstreet Boys themselves have worn. I personally loved the pair with the butterfly detail (very Y2K), and the light blue lenses instead of dark ones are a nice touch, so you can actually see. Trust me, you'll want to take in every visual The Sphere has to offer.