Britney Spears performed the now-iconic lyrics “I’m not a girl, not yet a woman” on track four of her 2001 album Britney. Though the phrase alluded to her current stage of life, it also reflected the pop star’s changing personal style. With her first two studio albums, “… Baby One More Time” and “Oops!… I Did It Again,” the then-20-year-old gave up her innocent schoolgirl look in favor of sexier costumes and a more provocative sound for her third.

1. For occasions, Spears experimented with kitschier styles, which were frequently styled by the team, Kurt and Bart. Take, for example, the patchwork denim gown they created for her for the 2001 American Music Awards (her boyfriend at the time, Justin Timberlake, also wore a matching denim suit.) Spears donned a Dolce & Gabbana black lace dress at the VMAs the following year, and it was the buzz of the town.

2. Britney Spears has always known how to work the dance floor, but at the 2000 American Music Awards, she showed that she could also drop it low in this gray jumpsuit.

3. Is it possible for Britney Spears to get any hotter than this? In 2012, she auditioned for “The X Factor” in Providence, Rhode Island, and wore this flaming red body-hugging garment. Please turn on the air conditioning!

4. Isn’t Britney Spears’ flapper girl adorable? With this playful gown she wore to the 2003 American Music Awards, the “Toxic” singer gave 1920s fashion a modern spin.

5. Britney Spears is the queen of the LBD! In 2013, she made an appearance at the Planet Hollywood Resort and Casino in Las Vegas, wearing this classic piece with some sparkles on top.