Many of today's hottest music stars have been around for more than a decade, so the perfect way to get excited for Sunday's Billboard Music Awards is to look back at shows past. People like Britney Spears [1], Beyoncé, and Justin Timberlake [2] stole the spotlight back in the late '90s and early 2000s, hitting the stage to perform and present alongside Nelly, Alicia Keys [3], Pink, and more. Meanwhile, music icons like Madonna [4] and Celine Dion popped up more than a few times, and Gwen Stefani [5] showed off her style several years in a row. Look back at some old-school, must-see photos from the Billboard Music Awards.