CMT's Katie Cook has donated the dress she wore on the finale of Nashville Star to raise money for her favorite charity, Walden's Puddle. The designer dress is up for bid through Sept. 11. The charcoal grey dress features heavy black beadwork and is from the designer Mandalay. Proceeds from the auction are designated for Walden's Puddle, a wildlife rehabilitation and education center located in Joelton, Tenn. Learn about the auction.