Style Battle

Who would've thought that two of our favorite fashionable fixtures actually share the same birthday? Tomorrow marks both Rachel Bilson's 31st and Blake Lively's 25th, making it a pretty special day. Both ladies possess amazing styling skills — Rachel excels at crafting the coolest in street-styled looks, while Blake has us completely awestruck with her red-carpet appearances. In honor of the very chic birthday girls, we've put together a look at their fashion résumés — both on and off the red carpet — and it's up to you to settle the score: which of the birthday girls takes the win? Click through and cast your vote!

Additional reporting by Robert Khederian

We have a confession to make: we're seriously addicted to Revenge — partly because of the thrilling plot twists, Emily's take-no-prisoners approach to avenging her father, and in huge part because of the show's killer fashion. Both of the series's leads, Ashley Madekwe and Emily VanCamp, show off an enviable wardrobe of cocktail dresses, easy beach wear (it is the Hamptons after all!), and everyday looks we're dying to steal. So, we got to thinking about the actresses' style off screen. How do the style-setters' looks compare when they're not on camera? We dug through the archives and some of the ladies' most recent pics to put them head to head. Click through to see the Revenge girls face off in our latest style battle — then be sure to tell us whose fashion wins out.

Breaking Dawn Part I hits theaters this Friday — and while some people are already getting in line, we're putting together red carpet résumés for two of the film's stars, Nikki Reed and Ashley Greene. At the NYC premiere last night, the two both chose modern cut-out gowns to show off their svelte figures. Nicki opted for a neon Michael Kors Resort dress with cutouts. a thigh-high slit, and a sleeked back hairdo to the complete the look. Ashley showed off her abs in a black and white gown by Donna Karan, finished off a side-parted 'do, red nails, and gorgeous drop earrings. Two Twilight girls, one fierce fashion faceoff — who's got the upper hand when it comes to rocking the red carpet? Click through, cast your vote, and see the rest of their red carpet looks!

Megan Fox solidified her bombshell status with Michael Bay's Transformers franchise, but when the third installment — and one of this Summer's most anticipated blockbusters — opens June 29, Shia LaBeouf will have a new leading lady at his side. The gorgeous Rosie Huntington-Whiteley is stepping in, and taking on her first big-screen role as the beautiful-cum-tough girl lead. We realize, of course, that both women elicit a jaw-dropping reaction when they step on the red carpet, but in honor of Transformers: Dark of the Moon's opening tomorrow, we're asking you to pick a favorite. Will you choose former Victoria's Secret model Rosie's English-rose beauty, or Megan's dark, just-a-little-dangerous sexiness? Click through for 25 of Megan and Rosie's hottest red carpet styles, and decide who takes this style battle.

Here at Fab, British beauties and style icons Alexa Chung and Sienna Miller have each claimed a place in our fashion hearts. They're both a go-to source for style inspiration, whether they're gracing a red carpet or passing through Heathrow — Alexa for her tomboy-eclectic ways, Sienna for her effortless-chic. But, when it comes to picking a favorite, we're a little divided here in the office; that's why we're leaving it up to you! Click through for 25 of Sienna and Alexa's memorable fashion moments, then cast your vote for the Brit with the best style sense.

This week, we started a brand-new feature called Style Battle and kicked it off with Whitney Port vs. Olivia Palermo! Now, with Project Runway's finale tonight, we thought it would be fun to pin Heidi Klum and Nina Garcia against one another. But don't worry, it's merely a friendly style competition — the sassy Heidi against the sophisticated Nina. Just click through to see the fashionistas go head to head in their most Fab outfits, then vote for your favorite at the end. It's on!