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Pop Princesses: Then and Now

Last week, Britney Spears celebrated her 30th birthday. Both Jessica Simpson and Beyoncé are currently pregnant. Christina Aguilera and J. Lo have found a second success—and gained legions of new fans—in the world of reality television. Make no mistake about it: pop's It Girls of the late '90s and early aughts are back and better than ever.

Question is...were they even "gone" to begin with? And now that they're older and (perhaps) wiser, have their style statements improved as well? Click through the gallery to compare the music moguls' looks from back in the day with what they're sporting now. Plus, shop items inspired by each of our favorite pop phenoms.

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Britney Spears: Then

Back when Brit Brit first hit the scene in 1999, she had quite a thing for snug-fitting crop tops.

WireImage

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Britney Spears: Now

Touring the world to promote her album Femme Fatale, Britney's all about...er, crop tops. Well, they are gonna be big for spring.

Getty Images

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Britney Spears: Shop It

A modern-day take on the pop princess' fave abbreviated shirt.

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Christina Aguilera: Then

In her "Dirrty"-er days, Xtina frequently picked lower-than-low denim, teensy tops, a beauty pageant's worth of bronzer and...blonde dreadlocks?

Fairchild Archive

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Christina Aguilera: Now

The golden-voiced songstress still favors a bold beauty look, but often chooses leather separates, black leggings and Louboutin pumps while playing judge on The Voice. And as for the occasional bit of backlash over her body-conscious picks and newfound curves, well, Christina would probably consider that something that makes her "a fighter."

FilmMagic

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Christina Aguilera: Shop It It

The roughed-up black leather finish and bevy of zippers makes this little topper totally Aguilera-esque.

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Jessica Simpson: Then

Our December cover girl first hit it big in 1999, when she released her debut album Sweet Kisses. Her powerhouse pipes and girlish image were so sweet, in fact, that they helped her launch her own edible beauty collection, Dessert. She often hit the scene with her own personal man candy, boyfriend-turned-husband-turned-ex-husband Nick Lachey.

WireImage

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Jessica Simpson: Shop It

If there's two things Simpson's adored since her industry debut, they're designer Michael Kors and soft knitwear.

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Mandy Moore: Then

Shortly after releasing her debut single "Candy," Mandy dyed her blonde locks brown, chopped them into an edgier pixie cut and began moonlighting as an actress in films like A Walk to Remember. She famously favored comfier duds than many of her pop contemporaries—especially Juicy Couture tracksuits and UGG boots.

Fairchild Archive

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Mandy Moore: Now

She's kept the brunette 'do, but stepped up her style game. Today, Mandy chooses fitted frocks in ladylike silhouettes from Marchesa and Monique Lhuillier.

Fairchild Archive

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Mandy Moore: Shop It

Mandy's favorite Juicy sweats, updated. All the comfort with none of the soccer-mom connotations.

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Jennifer Lopez: Then

Back when it was somewhat believable that Jenny hailed from "the block," she stunned onlookers in dramatic red-carpet confections...like this iconic tropical-print Versace at the 2000 Grammy Awards.

Photonews via Getty Images

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Jennifer Lopez: Now

The artist formerly known as J.Lo still has a taste for the finer things in life. Now a judge on American Idol, Jennifer wows in jaw-dropping gowns...like this Gucci dress she picked for the Met Gala back in May.

Fairchild Archive

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Jennifer Lopez: Shop It

Sheer? Check. Leopard-spotted? Check. Vibrantly colored? You bet. This one's got "J.Lo" written all over it.

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Beyoncé Knowles: Then

As one of the founding members of girl group Destiny's Child, Beyoncé often took to the red carpet wearing shiny, figure-hugging getups designed by her mom Tina.

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Beyoncé Knowles: Shop It

Wonderfully similar to the sequined Dolce & Gabbana blazer B sported at the VMAs. And it was designed by another Hollywood heavy-hitter, so you know it's good.

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