Brace yourself and prepare to feel old: Britney Spears’ debut album, …Baby One More Time, has turned 20.

Released on Jan. 12, 1999, the LP instantly crowned Spears as the princess of teen pop. It would go on to be certified diamond, with more than 14 million albums sold, while the title tune became a classic that defined a generation of schoolgirls.

To celebrate the 20th anniversary of this landmark album, we rank every single track.