Before there was Blake Shelton and Gwen Stefani, or Alicia Keys and Swizz Beatz or even Beyoncé and Jay-Z, there was Justin Timberlake and Britney Spears. 

Pop music's golden couple, they were pretty much the cutest thing you ever did see when they began dating in 1999, sharing anecdotes about how they developed mutual crushes while working together as tweens in 1992 on The All-New Mickey Mouse Club (he was her first kiss!) before reconnecting seven years later. At the time, she was just about to break through with her multiplatinum debut ...Baby One More Time that made school uniforms cool and parents aghast and he was hard at work on 'N Sync's follow up to their equally successful self-titled release.