Who could resist Blake Lively in a leather mini? Apparently not you! The red hot star looked great while pitching in for a great cause at the 12-12-12 Concert for Sandy Relief. Thanks to her Isabel Marant design, Mrs. Ryan Reynolds was this week's most popular pin. Vote for her studded little red dress or any of the Look of the Day picks, then let us know what else you're obsessing over at pinterest.com/instylemag by repinning, liking, or commenting on any of our 67 stylish boards—or by clicking the link below.