Reese Witherspoon, pictured here in 1994, had a dazzling post-divorce transformation in 2007, which she credits to her style guru, Nina Ricci designer Olivier Theyskens. "I feel like I look different than I've ever looked!" says Reese, who adds that while reviewing her old wardrobe recently, "I looked at the stuff and thought, 'What was I thinking?'"
Paris Hilton and Nicole Richie have come a long way since their days on The Simple Life in 2003.
Former Lizzie McGuire star Hilary Duff, just 14 in 2002, was definitely a fashion don't during her Disney Channel days, thanks to getups like this denim jeans-and-jacket combo.
Back in the day, Katherine Heigl (photographed in 2000) named old-Hollywood beauty Rita Hayworth as her fashion icon — but only after hitting it big did she learn to emulate the legendary glamour gal's style!
As a D-list player on The Young and the Restless in the early 2000s, Eva Longoria was practically forced to wear trashy ensembles like this torso-baring jacket and patchwork lowriders — or at least that's what she claims. When she approached some top designers about wearing their clothing, says Eva, 32, "they said, 'Who are you? We're not dressing you!'"
Save the cheerleader's... style rep! Before she donned her hot Heroes uniform — and shot to chic celebrity — Hayden Panettiere went for garish getups. Check out this outfit from 2003!
Rihanna, seen here in 2005, went from a good girl to a fierce fashion diva!
The O.C.'s Rachel Bilson had a bleak sense of style in 2003.
Jessica Alba's look was Plain Jane at the Italian Job premiere in 2003.
After winning American Idol in 2005, Oklahoma-bred Carrie Underwood, then 21, complained that "people look at me like I must be a country bumpkin!" But now Carrie is big-city chic!