Zac Posen Reveals How He Made Claire Danes' Electrifying Look

Zac Posen is sharing the secrets behind the dress that lit up the Met Gala on Monday night.

The designer spoke to INSIDE EDITION about Claire Danes’ Cinderella-like gown, which was illuminated by LED lights.

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“Each panel of fabric, the yarns are connected to a small little battery and that’s what charges it,” he explained.

The 30 separate light panels had to be manually switched on to create the electrifying look, he said. The result was breathtaking.

Read: See The Most Eye-Catching Looks From the Met Gala

“It just worked,” he said. “It was a magic moment.”

Posen was thrilled with the result.

"When a piece of fashion becomes something cultural and a dialogue – that’s why I do what I do," he said.

Watch: 25 Electric Fashions From the Met Gala