"...Baby One More Time" (1998) And a star is born. Is there a more indelible image from the late-90s than a then-16-year-old Spears dressed as a schoolgirl, dancing around in a pigtails and knee-high socks? That video and its iconic costume set the tone for the first few years of her career, blending innocence with a subversive and at times unsettling sexuality.

"Sometimes" (1999) Remember that time Brit "injured her knee" during rehearsals for this video and had to be laid up for a few weeks? Then "Sometimes" finally came out and her boobs were huge? Anyway, Spears continued her virginal trek in an all-white, belly-bearing ensemble and a drawstring pant. Oh, the 90s.

"(You Drive Me) Crazy" (1999) Brit brought along a young, pre-Entourage Adrien Grenier and a post-Clarissa Explains It All/Sabrina The Teenaged Witch-era Melissa Joan Hart for this dancefest and began her love affair with character costumes as a sexy waitress. But the green lamé midriff top and jazz pant ensemble was particularly memorable.

"Oops!...I Did It Again" (2000) Britney continued sexing up her image, this time in a skin-tight red latex catsuit that left little to the imagination. Meanwhile, her music video-related injuries also continued when a camera fell on the poor girl's head and she reportedly received a concussion only to return to work four hours later. And suddenly it all starts making sense.

"Lucky" (2000) Things got a little classy when Britney channeled her inner old Hollywood starlet, donning a glamorous negligee and even a fake mole to portray the titular Lucky, a girl who seems to have everything but is still sad on the inside...right.

"I'm a Slave 4 U" (2001) Sampling Vanity 6's classic "Nasty Girl," Britney got a bit nasty herself with a sexy, barely-there bustier and the still questionable thong-over-leather-jeans look that no one else could or should even try to pull off.

"Me Against the Music" (2003) Brit teamed up with her idol Madonna and they both donned a smoking -- Madge in all white and Brit in black pinstripes with a floating turquoise collar (why not?) -- before preceding to get all kinds of weird with each other.

"Toxic" (2004) First of all, can we talk about the stewardess look? It's kinda perfect and kinda wrong all at the same time. That keyhole and bolero-esque statement shoulder? Very 60s version of futuristic. But let's move on to the real star of this video: Brit's naked body covered in diamonds. I've never been more proud of our little girl who was definitely now a woman.

"Gimme More" (2007) "Gimme More" has the distinction of being one of Britney's best songs and worst videos, but can you really blame her? Homegirl was going through a very public breakdown; shaving her head, jamming umbrellas into car windows, crying on sidewalks -- basically everyone's early 20s. The result: cheap wigs, tacky leather jacket, trashy fishnets and a Liza Minnelli in Cabaret bowler with a Liza Minnelli in 2007 dazed expression.

"Womanizer" (2008) The Spears comeback train finally got back on the rails -- and stopped blowing them -- with "Womanizer," or as I like to refer to it, "Toxic -- Part 2": Britney donning several disguises and abusing her boyfriend. I've always been partial to a sexy librarian look, however, and Brit looks great in a bob.

"Hold It Against Me" (2011) Taking a page from Alexander McQueen's brilliant spring 2009 show in which Shalom Harlow was violated by some paint-spewing robotic arms, Britney's flowing white gown ends up splattered in paint, though the culprits in this case are some fantastic, paint-spewing finger gloves.

"Till the World Ends" (2011) If "Womanizer" was "Toxic Part 2," then "Till the World Ends" is definitely the sequel to "I'm a Slave 4 U" -- sweating, gyrating, heaving and heavy breathing -- only this time with more clothes, including a Burberry Prorsum jacket and this corseted, red bodysuit.

Adrien Grenier at the premiere of “Standard Operating Procedure” looks like …

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