It’s Britney, bitch. And she’s back with a new album (Britney Jean) and a Las Vegas residency to close out 2013. Leave it to the singer to make us work all year just to hear some new music. But that’s okay, because there’s so much Britney to enjoy. After 15 years in the music business, Spears has left us with a number of memories and a few not-so-easy-to-forget moments. We thought this would be a great time to break down the singer’s career from A to Z.