Oh baby, baby.

25 million copies sold and 20 years later, Britney Spears' debut album, ...Baby One More Time, is still the pop icon's most successful album ever. And it makes sense, seeing as how the 37-year-old's first outing lead the resurgence of teen pop music and defined a generation.

Spears, then just 17 and somewhat known for her time on The Mickey Mouse Club as a child, became the most famous teenager in the world...and since then, the world has never stopped being transfixed by the princess of pop. 

But did you know her iconic "...Baby One More Time" single, one of the most successful songs of all-time, almost went to another artist? 

...Baby One More Time was released on Jan. 12, and thanks to the monster success of its first single and its accompanying music video of the same time, went on to become the second best-selling album of 1999, and is still one of the best-selling albums of all-time.

And in an era where music groups (TLC, Backstreet Boys, The Spice Girls, 'N Sync, etc.) were dominating the music scene, Spears' solo success at such a young age was almost unprecedented and helped lead the charge for teen queens such as Christina Aguilera, Mandy Moore and Jessica Simpson. She held the Guinness World Record for having the "best-selling album by a teenage solo artist." 

To pay proper respect to the genre-defining album's anniversary, we're going back to 1999 and revealing some secrets about Spears, ...Baby One More Time and that schoolgirl out...

Britney Spears, Baby One More Time

Jive Records

Britney Spears, Baby One More Time, Video, GIF

Jive Records

Baby One More Time, Britney Spears

Britney Spears, 1999

Kevin Mazur/WireImage

Britney Spears, 1999

Ke.Mazur/Jason Nevader/WireImage.com

Britney Spears, Justin Timberlake, 2001 American Music Awards

LUCY NICHOLSON/AFP/Getty Images

Britney Spears, Baby One More Time Tour, 1999

Larry Marano/Getty Images

Drive Me Crazy, Britney Spears, Melissa Joan Hart

Vevo

Britney Spears, Early 2000s Fashion, Grammys

Getty Images

Britney Spears, From the Bottom of My Broken Heart

YouTube

Britney Spears, Baby One More Time Tour

Bobby Bank/WireImage

Backstreet Boys, 1995

Tim Roney/Getty Images

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