Riddle me this: What former American Idol crooner accepted the CMA‘s Horizon Award (for best country music newcomer) Monday night in an $850K diamond dress, courtesy of Kwiat and David Rodriguez?

Carrie Underwood sparkled at the podium in the custom-made gown, which will be auctioned from Nov. 26 to Dec. 6 on gottahaveit.com. Proceeds to benefit the Humane Society of the United States’ Rural Area Veterinary Services (Carrie’s pick) and The Make-A-Wish Foundation (Kwiat’s choice).

JCK