Style SOS: Carrie Underwood's Dress

I was wondering if you might know who designed this dress? It's white with baloon sleeves and sequined. I hope the picture is okay. Your blog is awesome and you know quite a lot about fashion so I was hoping you might know :)

Thank you so much for any help.

Happy Holidays!

- Amanda



Can any body help us in identifying the dress worn by Carrie Underwood in her Holiday Special? Pretty please?