Valued at $634.50 this stunning pair of heels from the fabulous designers at De Siena is officially Fash Boulevard's biggest giveaway to date. Pictured above is the perfectly chic Pas Platform Sandal that myself and De Siena are teaming up to giveaway to one lucky Fash reader. For a chance to win these avant-garde style heels simply "like" Fash Boulevard's Facebook fan page here and De Siena's fan page here. Be sure to leave a comment on their fan page saying, "I heart the Fash Boulevard & De Siena giveaway" to be officially entered! For an extra entry... follow Fash Boulevard on Twitter here and on BlogLovin here. And don't forget to leave a comment below with your e-mail in case you're the lucky winner of these gorgeous zig zag platform pumps. The giveaway will run until Sunday, February 26th and is open to everyone.