As she sang "Blown Away" and " Two Black Cadillacs" various images flashed on her dress.
"They can do a lot of amazing things with projectors these days," she said backstage, holding her trophy for best country solo performance. "We had a dress especially made. I said I should take that home and we can watch movies on it."
Ms. Underwood said she had to stand in a specific spot on the Staples Center stage to make it work.
"It took a lot of precision," she said.
She told Entertainment Tonight later that she was barefoot and standing on an apple crate to get her dress it the precise height for the images.
Underwood won best country solo performance for "Blown Away," which was a her sixth Grammy Award. The Zac Brown Band won best country album for "Uncaged," and Kelly Clarkson turned in the night's most exuberant acceptance speech after winning best pop vocal album for "Stronger." After hugging much of the front row and momentarily getting stuck to Miranda Lambert's dress, Ms. Clarkson charged the stage with a giant smile.
Underwood wore over $31 million in diamonds and other jewels by designer Johnathon Arndt. Underwood's necklace alone featured 381 carats of oval, pear, marquis, and round brilliant white diamonds, according to a press release from the jeweler.