The following is a guest post from one of our favorite shopping destinations, Decadestwo.

Greetings, fellow fashionistas! We’re Decadestwo, the shopping spot for Tinseltown’s most glamorous gals since 1999. Our home base is in the heart of Hollywood, but we’re known worldwide as a premiere consignment retailer for 21st century designer fashion. It’s our objective to find you that limited-edition Chanel piece you’ve been searching for all your life; the must-have YSL bag you’ve always wanted; those perfect Louboutins that will complete every outfit. Learn more about our new weekly feature for InStyle.com (including how to win this Versace dress worn by Garcelle Beauvais) after the jump!

Every Tuesday, we’ll be giving you previews of our favorite new pieces—only the best of the designer fashion and accessories that come through our doorscurated exclusively for InStyle readers by our expert staff, including style guru/Decadestwo co-founder Christos Garkinos. Plus, look out for sneak peeks inside the closets of some of the world’s most stylish women!

First on the list? Garcelle Beauvais. A longtime friend and client, Beauvais shopped our racks to find this Fall 2008 Versace dress—originally $4000—for the premiere of Valentine’s Day. She rocked it beautifully on the red carpet and then paid the fashion forward by reconsigning the dazzling dress to Decadestwo. But instead of selling it again, we want to give it away—to you! Today starting at 2 p.m. EST, be the 200th person to follow us on Twitter and you will be the next style star to work it in this sexy dress (valued at $950)!

Check back every Tuesday for more fabulous finds and insider access into Hollywood’s most desirable wardrobes. Plus, send us your burning style questions and share your own ultimate must-haves in the comments section. We’ll be watching—and answering!